MaxLength Property breaks in my custom TextBox

MaxLength Property breaks in my custom TextBox - c#

For my WPF apps I have created a couple custom controls based on a TextBox. These include NumericTextBox, WatermarkTextBox, and ReturnTextBox.
Numeric and Watermark inherit from ReturnTextBox, which inherits from TextBox.
When I go to use any of my custom textboxes they work great. The one problem seems to be NumericTextBox and the MaxLength property. The property is now ignored and does not work. There is no code in any of my custom controls overriding or messing with the MaxLength property.
When I use MaxLength on my ReturnTextBox, it works just as you would expect:
<ui:ReturnTextBox MaxLength="35" Width="500" Background="LightYellow" Text="{Binding BrRptCorpName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" TabIndex="2" />
However when I use the property on my NumericTextBox it is ignored and does not work:
<ui:NumericTextBox MaxLength="9" Background="LightYellow" Text="{Binding BrRptAmt, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" TabIndex="1" />
Can anyone help me figure out why MaxLength stops working? Is it because NumericTextBox does not directly inherit from TextBox? Should I be overriding MaxLength property in ReturnTextBox so it can be used by Numeric?
UPDATED WITH CODE
ReturnTextBox class:
public class ReturnTextBox : TextBox
{
static ReturnTextBox()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(ReturnTextBox), new FrameworkPropertyMetadata(typeof(ReturnTextBox)));
}
protected override void OnPreviewKeyDown(KeyEventArgs e)
{
if (e.Key == Key.Return)
{
e.Handled = true;
MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
}
base.OnPreviewKeyDown(e);
}
}
NumericTextBox
public class NumericTextBox : ReturnTextBox
{
#region Base Class Overrides
static NumericTextBox()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(NumericTextBox), new FrameworkPropertyMetadata(typeof(NumericTextBox)));
}
public static readonly DependencyProperty TypeProperty = DependencyProperty.Register("Type",
typeof(NumericType), typeof(NumericTextBox), new UIPropertyMetadata (NumericType.Integer));
public static readonly DependencyProperty SelectAllOnGotFocusProperty = DependencyProperty.Register("SelectAllOnGotFocus",
typeof(bool), typeof(NumericTextBox), new PropertyMetadata(false));
[Description("Numeric Type of the TextBox"), Category("Common Properties")]
public NumericType Type
{
get { return (NumericType)GetValue(TypeProperty); }
set { SetValue(TypeProperty, value); }
}
[Description("Select text on focus"), Category("Common Properties")]
public bool SelectAllOnGotFocus
{
get
{
return (bool)GetValue(SelectAllOnGotFocusProperty);
}
set
{
SetValue(SelectAllOnGotFocusProperty, value);
}
}
protected override void OnPreviewTextInput(TextCompositionEventArgs e)
{
Text = ValidateValue(Type, Text);
bool isValid = IsSymbolValid(Type, e.Text);
e.Handled = !isValid;
if (isValid)
{
int caret = CaretIndex;
string text = Text;
bool textInserted = false;
int selectionLength = 0;
if (SelectionLength > 0)
{
text = text.Substring(0, SelectionStart) + text.Substring(SelectionStart + SelectionLength);
caret = SelectionStart;
}
if (e.Text == NumberFormatInfo.CurrentInfo.NumberDecimalSeparator)
{
while (true)
{
int ind = text.IndexOf(NumberFormatInfo.CurrentInfo.NumberDecimalSeparator);
if (ind == -1)
break;
text = text.Substring(0, ind) + text.Substring(ind + 1);
if (caret > ind)
caret--;
}
if (caret == 0)
{
text = "0" + text;
caret++;
}
else
{
if (caret == 1 && string.Empty + text[0] == NumberFormatInfo.CurrentInfo.NegativeSign)
{
text = NumberFormatInfo.CurrentInfo.NegativeSign + "0" + text.Substring(1);
caret++;
}
}
if (caret == text.Length)
{
selectionLength = 1;
textInserted = true;
text = text + NumberFormatInfo.CurrentInfo.NumberDecimalSeparator + "0";
caret++;
}
}
else if (e.Text == NumberFormatInfo.CurrentInfo.NegativeSign)
{
textInserted = true;
if (Text.Contains(NumberFormatInfo.CurrentInfo.NegativeSign))
{
text = text.Replace(NumberFormatInfo.CurrentInfo.NegativeSign, string.Empty);
if (caret != 0)
caret--;
}
else
{
text = NumberFormatInfo.CurrentInfo.NegativeSign + Text;
caret++;
}
}
if (!textInserted)
{
text = text.Substring(0, caret) + e.Text +
((caret < Text.Length) ? text.Substring(caret) : string.Empty);
caret++;
}
try
{
double val = Convert.ToDouble(text);
double newVal = val;//ValidateLimits(GetMinimumValue(_this), GetMaximumValue(_this), val);
if (val != newVal)
{
text = newVal.ToString();
}
else if (val == 0)
{
if (!text.Contains(NumberFormatInfo.CurrentInfo.NumberDecimalSeparator))
text = "0";
}
}
catch
{
text = "0";
}
while (text.Length > 1 && text[0] == '0' && string.Empty + text[1] != NumberFormatInfo.CurrentInfo.NumberDecimalSeparator)
{
text = text.Substring(1);
if (caret > 0)
caret--;
}
while (text.Length > 2 && string.Empty + text[0] == NumberFormatInfo.CurrentInfo.NegativeSign && text[1] == '0' && string.Empty + text[2] != NumberFormatInfo.CurrentInfo.NumberDecimalSeparator)
{
text = NumberFormatInfo.CurrentInfo.NegativeSign + text.Substring(2);
if (caret > 1)
caret--;
}
if (caret > text.Length)
caret = text.Length;
Text = text;
CaretIndex = caret;
SelectionStart = caret;
SelectionLength = selectionLength;
e.Handled = true;
}
base.OnPreviewTextInput(e);
}
private static string ValidateValue(NumericType type, string value)
{
if (string.IsNullOrEmpty(value))
return string.Empty;
value = value.Trim();
switch (type)
{
case NumericType.Integer:
try
{
Convert.ToInt64(value);
return value;
}
catch
{
}
return string.Empty;
case NumericType.Decimal:
try
{
Convert.ToDouble(value);
return value;
}
catch
{
}
return string.Empty;
}
return value;
}
private static bool IsSymbolValid(NumericType type, string str)
{
switch (type)
{
case NumericType.Decimal:
if (str == NumberFormatInfo.CurrentInfo.NegativeSign ||
str == NumberFormatInfo.CurrentInfo.NumberDecimalSeparator)
return true;
break;
case NumericType.Integer:
if (str == NumberFormatInfo.CurrentInfo.NegativeSign)
return true;
break;
case NumericType.Any:
return true;
}
if (type.Equals(NumericType.Integer) || type.Equals(NumericType.Decimal))
{
foreach (char ch in str)
{
if (!Char.IsDigit(ch))
return false;
}
return true;
}
return false;
}
protected override void OnGotFocus(RoutedEventArgs e)
{
base.OnGotFocus(e);
if (SelectAllOnGotFocus)
SelectAll();
}
protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
if (!IsKeyboardFocused && SelectAllOnGotFocus)
{
e.Handled = true;
Focus();
}
base.OnPreviewMouseLeftButtonDown(e);
}
As you can see I never override or make any changes to the MaxLength property in either of these two controls. However the MaxLength works with the ReturnTextBox and does not work with the NumericTextBox.
Thank you for your help!

e.Handled = !isValid and if(isValid) { e.Handled = true } are your problem. When you use the PreviewSomeEvent the they are tunneling. That means they go from the root and down to the source that caused the event. Setting the Handled property on the event means that other handlers in the events route won't be raised. MaxLength is something defined on the TextBox or at least on something more "primite" than your NumericTextBox.
What happens is that if the users input fail your validation, the event won't be raised "deeper down the tunnel" to check the length: e.Handled = !isValid. And if it passes your validation it wont be raised either because e.Handled = true.
Perhaps a useful analogy can be overriding a method and calling base or not.
For more on events check here

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How to make a xaml textbox in silverlight accept only numbers with maximum one decimal point precison. I have tried the answers in this question How to make a textBox accept only Numbers and just one decimal point in Windows 8. But it did not work. How can I do this ?

You can write a function like this,
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if (result == false)
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var thisKeyStr = "";
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thisKeyStr = ".";
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thisKeyStr = e.Key.ToString().Replace("D", "").Replace("NumPad", "");
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var s = (sender as TextBox).Text + thisKeyStr;
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e.Handled = true;
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Method to ensure only 1 decimal,
bool EnsureDecimalPlaces()
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string inText = txtDiscount.Text;
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How to get selected value or index of a dropdownlist upon entering a page?

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Here is the code behind (I removed a lot of the unimportant functions):
protected void Page_Init(object sender, System.EventArgs e)
{
string MyPath = HttpContext.Current.Request.Url.AbsolutePath;
MyPath = MyPath.ToLower();
_Basket = AbleContext.Current.User.Basket;
RedirQryStr = "";
_ProductId = AlwaysConvert.ToInt(Request.QueryString["ProductId"]);
if (Request.QueryString["LineID"] != null)
{
int LineID = Convert.ToInt32(Request.QueryString["LineID"].ToString());
int itemIndex = _Basket.Items.IndexOf(LineID);
BasketItem item = _Basket.Items[itemIndex];
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OldPrice.Text = item.Price.ToString();
}
int UnitMeasure = 0;
SetBaidCustoms(ref UnitMeasure);
GetPrefinishNote();
_ProductId = AlwaysConvert.ToInt(Request.QueryString["ProductId"]);
_Product = ProductDataSource.Load(_ProductId);
if (_Product != null)
{
//GetPercentage();
int _PieceCount = 0;
double _SurchargePercent = 0;
CheckoutHelper.GetItemSurcargePercent(_Product, ref _PieceCount, ref _SurchargePercent);
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SurchargePercent.Text = _SurchargePercent.ToString();
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this.Controls.Clear();
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{
if (Request.QueryString["Action"].ToString().ToLower() == "edit")
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protected void Page_Load(object sender, System.EventArgs e)
{
if (_Product != null)
{
if (ViewState["OptionDropDownIds"] != null)
{
_OptionDropDownIds = (Hashtable)ViewState["OptionDropDownIds"];
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{
_OptionDropDownIds = new Hashtable();
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if (ViewState["OptionPickerIds"] != null)
{
_OptionPickerIds = (Hashtable)ViewState["OptionPickerIds"];
}
else
{
_OptionPickerIds = new Hashtable();
}
_SelectedOptionChoices = GetSelectedOptionChoices();
OptionsList.DataSource = GetProductOptions();
OptionsList.DataBind();
//set all to the first value
foreach (RepeaterItem rptItem in OptionsList.Items)
{
DropDownList OptionChoices = (DropDownList)rptItem.FindControl("OptionChoices");
OptionChoices.SelectedIndex = 1;
}
TemplatesList.DataSource = GetProductTemplateFields();
TemplatesList.DataBind();
KitsList.DataSource = GetProductKitComponents();
KitsList.DataBind();
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if (!Page.IsPostBack)
{
if (_Product.MSRP != 0)
{
salePrice.Visible = true;
RetailPrice.Text = _Product.MSRP.ToString("$0.00");
}
DataSet ds = new DataSet();
DataTable ResultTable = ds.Tables.Add("CatTable");
ResultTable.Columns.Add("OptionID", Type.GetType("System.String"));
ResultTable.Columns.Add("OptionName", Type.GetType("System.String"));
ResultTable.Columns.Add("LinkHeader", Type.GetType("System.String"));
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{
string MasterList = GetProductMaster(_ProductId, PhOpt.OptionId);
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string LinkHeader = "";
string DefaultOption = "no";
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ProductDisplayHelper.TestForVariantDependency(ref SlaveHide, _ProductId, PhOpt, ref PrefinishMin, ref PerFootVal, ref LinkHeader, ref VisPlaceholder, ref HasDefault, ref DefaultOption);
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dr["LinkHeader"] = LinkHeader;
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ItemOptions.DataMember = "CatTable";
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{
ShowAddToBasket(1);
resetBtn.Visible = true;
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ShowAddToBasket(1);
SetDllAssociation(false);
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ShowHideDrops();
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}
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{
AddToBasketButton.Visible = false;
AddToWishlistButton.Visible = false;
resetBtn.Visible = false;
if (Request.QueryString["Action"] == null)
{
SelectAll.Visible = true;
WishGray.Visible = true;
if (Request.QueryString["OrderItemID"] == null)
BasketGray.Visible = true;
else
UpdateButton.Visible = false;
}
else
{
UpdateButton.Visible = true;
NewButtons.Visible = false;
}
if ((_Product.MinQuantity == 1) & (_Product.MaxQuantity == 1))
{
AddToWishlistButton.Visible = false;
BasketGray.Visible = false;
}
}
private void ShowAddToBasket(int place)
{
resetBtn.Visible = true;
if (Request.QueryString["Action"] != null)
{
UpdateButton.Visible = true;
NewButtons.Visible = false;
}
else
{
UpdateButton.Visible = false;
SelectAll.Visible = false;
WishGray.Visible = false;
BasketGray.Visible = false;
if (Request.QueryString["OrderItemID"] == null)
{
AddToBasketButton.Visible = true;
resetBtn.Visible = true;
AddToWishlistButton.Visible = true;
}
else
{
UpdateButton.Visible = true;
AddToBasketButton.Visible = false;
}
}
if ((_Product.MinQuantity == 1) & (_Product.MaxQuantity == 1))
{
AddToWishlistButton.Visible = false;
BasketGray.Visible = false;
resetBtn.Visible = true;
}
}
protected void OptionChoices_DataBound(object sender, EventArgs e)
{
DropDownList ddl = (DropDownList)sender;
if (ddl != null)
{
//bb5.Text = "ddl !=null<br />"; works
List<OptionChoiceItem> ds = (List<OptionChoiceItem>)ddl.DataSource;
if (ds != null && ds.Count > 0)
{
int optionId = ds[0].OptionId;
Option opt = OptionDataSource.Load(optionId);
ShowAddToBasket(4);
OptionChoiceItem oci = ds.FirstOrDefault<OptionChoiceItem>(c => c.Selected);
if (oci != null)
{
ListItem item = ddl.Items.FindByValue(oci.ChoiceId.ToString());
if (item != null)
{
ddl.ClearSelection();
item.Selected = true;
}
}
if (opt != null && !opt.ShowThumbnails)
{
if (!_OptionDropDownIds.Contains(optionId))
{
// bb5.Text = "!_OptionDropDownIds.Contains(optionId)<br />"; works
_OptionDropDownIds.Add(optionId, ddl.UniqueID);
}
if (_SelectedOptionChoices.ContainsKey(optionId))
{
ListItem selectedItem = ddl.Items.FindByValue(_SelectedOptionChoices[optionId].ToString());
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{
ddl.ClearSelection();
selectedItem.Selected = true;
//bb5.Text = "true: " + selectedItem.Selected.ToString()+"<br />"; doesn't work
}
}
StringBuilder imageScript = new StringBuilder();
imageScript.Append("<script type=\"text/javascript\">\n");
imageScript.Append(" var " + ddl.ClientID + "_Images = {};\n");
foreach (OptionChoice choice in opt.Choices)
{
if (!string.IsNullOrEmpty(choice.ImageUrl))
{
imageScript.Append(" " + ddl.ClientID + "_Images[" + choice.Id.ToString() + "] = '" + this.Page.ResolveUrl(choice.ImageUrl) + "';\n");
}
}
imageScript.Append("</script>\n");
ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page);
if (scriptManager != null)
{
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), ddl.ClientID, imageScript.ToString(), false);
}
else
{
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), ddl.ClientID, imageScript.ToString());
}
}
}
ddl.Attributes.Add("onChange", "OptionSelectionChanged('" + ddl.ClientID + "');");
}
}
protected Dictionary<int, int> GetSelectedOptionChoices()
{
HttpRequest request = HttpContext.Current.Request;
Dictionary<int, int> selectedChoices = new Dictionary<int, int>();
if (Page.IsPostBack)
{
foreach (int key in _OptionDropDownIds.Keys)
{
string value = (string)_OptionDropDownIds[key];
Trace.Write(string.Format("Checking For - OptionId:{0} DropDownId:{1}", key, value));
string selectedChoice = request.Form[value];
if (!string.IsNullOrEmpty(selectedChoice))
{
int choiceId = AlwaysConvert.ToInt(selectedChoice);
if (choiceId != 0)
{
Trace.Write(string.Format("Found Selected Choice : {0} - {1}", key, choiceId));
selectedChoices.Add(key, choiceId);
}
}
}
foreach (int key in _OptionPickerIds.Keys)
{
string value = (string)_OptionPickerIds[key];
Trace.Write(string.Format("Checking For - OptionId:{0} PickerId:{1}", key, value));
string selectedChoice = request.Form[value];
if (!string.IsNullOrEmpty(selectedChoice))
{
int choiceId = AlwaysConvert.ToInt(selectedChoice);
if (choiceId != 0)
{
Trace.Write(string.Format("Found Selected Choice : {0} - {1}", key, choiceId));
selectedChoices.Add(key, choiceId);
}
}
}
}
else
{
string optionList = Request.QueryString["Options"];
ShowAddToBasket(2);
if (!string.IsNullOrEmpty(optionList))
{
string[] optionChoices = optionList.Split(',');
if (optionChoices != null)
{
foreach (string optionChoice in optionChoices)
{
OptionChoice choice = OptionChoiceDataSource.Load(AlwaysConvert.ToInt(optionChoice));
if (choice != null)
{
_SelectedOptionChoices.Add(choice.OptionId, choice.Id);
}
}
return _SelectedOptionChoices;
}
}
}
return selectedChoices;
}
protected void SetDDLs(object sender, EventArgs e)
{
bool isRandom = false;
if (LengthDDL.Text != "")
isRandom = true;
SetDllAssociation(isRandom);
}

Try accessing the values in the Page_Load event. I don't believe the values are bound yet in Page_Init

To check if var is String type

I have a problem in code in C#:
I don't know how to implement logic - iterating through Hashtable
having values of different data types, the schema I want is below:
if the value in variable is String type
{
do action1;
}
else
{
do action2;
}
There is a hashtable containing data of Types - String and Int (combined):
public string SQLCondGenerator {
get
{
Hashtable conditions = new Hashtable();
//data having String data type
conditions.Add("miap", ViewState["miap_txt"]);
conditions.Add("pocode", ViewState["po_txt "]);
conditions.Add("materialdescription", ViewState["mat_desc_txt"]);
conditions.Add("suppliername", ViewState["supplier_txt"]);
conditions.Add("manufacturername", ViewState["manufacturer_txt"]);
//data having Int32 data type
conditions.Add("spareparts", ViewState["sp_id"]);
conditions.Add("firstfills", ViewState["ff_id"]);
conditions.Add("specialtools", ViewState["st_id"]);
conditions.Add("ps_deleted", ViewState["ps_del_id"]);
conditions.Add("po_manuallyinserted", ViewState["man_ins_id"]);
String SQLCondString = "";
String SQLCondStringConverted = "";
string s = string.Empty;
foreach (string name in conditions.Keys)
{
if (conditions[name] != null)
{
SQLCondString += name+ "=" +conditions[name]+ " and ";
Response.Write(conditions[name].GetType());
bool valtype = conditions[name].GetType().IsValueType;
if (valtype == string)
{
SQLCondString.Substring(0, SQLCondString.Length - 4);
SQLCondString += name + " and like '%" + conditions[name] + "%' and ";
}
}
}
//Response.Write("********************");
SQLCondStringConverted = SQLCondString.Substring(0, SQLCondString.Length - 4);
return SQLCondStringConverted;
}
}
May be I am wrong in coding, please advise!
Thanks!

if(conditions[name] is string)
{
}
else
{
}

Hmm, I'm not sure why you are calling IsValueType, but this should be sufficient:
if (conditions[name] is string)
{
///
}

Approach - 1
Int32 Val = 0;
if (Int32.TryParse("Your Value", out Val))
{
//Your Logic for int
}
else
{
//Your Logic for String
}
Approach - 2 (using Late Binding)
Int32 Val = 0;
dynamic conditions = new Hashtable();
conditions.Add("miap", ViewState["miap_txt"]);
conditions.Add("pocode", ViewState["po_txt "]);
foreach (string name in conditions.Keys)
{
if (Int32.TryParse(conditions[name].ToString(), out Val))
{
//Your Logic for int
}
else
{
//Your Logic for String
}
}

I had the same issue but I was using textBoxes and needed to validate if the input is alphabets,-, or .
I generated a keypress event on my textBox and inserted the following method to check each keypress and give a prompt if its not a valid character:
public static class Validator
{
public static bool IsNameString(TextBox tb, string name, KeyPressEventArgs e)
{
bool valid = true;
/* e.KeyChar contains the character that was pressed
e.Handled is a boolean that indicates that handling is done
if a bad character is entered, set e.Handled to true
*/
if (!char.IsLetter(e.KeyChar) && e.KeyChar != ' ' && e.KeyChar != '-' &&
e.KeyChar != '.' && e.KeyChar != (char)Keys.Back)
{
e.Handled = true;
valid = false;
MessageBox.Show(name+ " can only accept letters, space, - and .");
tb.Focus();
}
return valid;
}
}
usage:
private void txtCustomerName_KeyPress(object sender, KeyPressEventArgs e)
{
Validator.IsNameString(txtCustomerName, "Customer Name", e);
}

Numeric Data Entry in WPF

How are you handling the entry of numeric values in WPF applications?
Without a NumericUpDown control, I've been using a TextBox and handling its PreviewKeyDown event with the code below, but it's pretty ugly.
Has anyone found a more graceful way to get numeric data from the user without relying on a third-party control?
private void NumericEditPreviewKeyDown(object sender, KeyEventArgs e)
{
bool isNumPadNumeric = (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal;
bool isNumeric = (e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemPeriod;
if ((isNumeric || isNumPadNumeric) && Keyboard.Modifiers != ModifierKeys.None)
{
e.Handled = true;
return;
}
bool isControl = ((Keyboard.Modifiers != ModifierKeys.None && Keyboard.Modifiers != ModifierKeys.Shift)
|| e.Key == Key.Back || e.Key == Key.Delete || e.Key == Key.Insert
|| e.Key == Key.Down || e.Key == Key.Left || e.Key == Key.Right || e.Key == Key.Up
|| e.Key == Key.Tab
|| e.Key == Key.PageDown || e.Key == Key.PageUp
|| e.Key == Key.Enter || e.Key == Key.Return || e.Key == Key.Escape
|| e.Key == Key.Home || e.Key == Key.End);
e.Handled = !isControl && !isNumeric && !isNumPadNumeric;
}

How about:
protected override void OnPreviewTextInput(System.Windows.Input.TextCompositionEventArgs e)
{
e.Handled = !AreAllValidNumericChars(e.Text);
base.OnPreviewTextInput(e);
}
private bool AreAllValidNumericChars(string str)
{
foreach(char c in str)
{
if(!Char.IsNumber(c)) return false;
}
return true;
}

This is how I do it. It uses a regular expression to check if the text that will be in the box is numeric or not.
Regex NumEx = new Regex(#"^-?\d*\.?\d*$");
private void TextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
if (sender is TextBox)
{
string text = (sender as TextBox).Text + e.Text;
e.Handled = !NumEx.IsMatch(text);
}
else
throw new NotImplementedException("TextBox_PreviewTextInput Can only Handle TextBoxes");
}
There is now a much better way to do this in WPF and Silverlight. If your control is bound to a property, all you have to do is change your binding statement a bit. Use the following for your binding:
<TextBox Text="{Binding Number, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}"/>
Note that you can use this on custom properties too, all you have to do is throw an exception if the value in the box is invalid and the control will get highlighted with a red border. If you click on the upper right of the red border then the exception message will pop up.

I've been using an attached property to allow the user to use the up and down keys to change the values in the text box. To use it, you just use
<TextBox local:TextBoxNumbers.SingleDelta="1">100</TextBox>
This doesn't actually address the validation issues that are referred to in this question, but it addresses what I do about not having a numeric up/down control. Using it for a little bit, I think I might actually like it better than the old numeric up/down control.
The code isn't perfect, but it handles the cases I needed it to handle:
Up arrow, Down arrow
Shift + Up arrow, Shift + Down arrow
Page Up, Page Down
Binding Converter on the text property
Code behind
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
namespace Helpers
{
public class TextBoxNumbers
{
public static Decimal GetSingleDelta(DependencyObject obj)
{
return (Decimal)obj.GetValue(SingleDeltaProperty);
}
public static void SetSingleDelta(DependencyObject obj, Decimal value)
{
obj.SetValue(SingleDeltaProperty, value);
}
// Using a DependencyProperty as the backing store for SingleValue. This enables animation, styling, binding, etc...
public static readonly DependencyProperty SingleDeltaProperty =
DependencyProperty.RegisterAttached("SingleDelta", typeof(Decimal), typeof(TextBoxNumbers), new UIPropertyMetadata(0.0m, new PropertyChangedCallback(f)));
public static void f(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
TextBox t = o as TextBox;
if (t == null)
return;
t.PreviewKeyDown += new System.Windows.Input.KeyEventHandler(t_PreviewKeyDown);
}
private static Decimal GetSingleValue(DependencyObject obj)
{
return GetSingleDelta(obj);
}
private static Decimal GetDoubleValue(DependencyObject obj)
{
return GetSingleValue(obj) * 10;
}
private static Decimal GetTripleValue(DependencyObject obj)
{
return GetSingleValue(obj) * 100;
}
static void t_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
TextBox t = sender as TextBox;
Decimal i;
if (t == null)
return;
if (!Decimal.TryParse(t.Text, out i))
return;
switch (e.Key)
{
case System.Windows.Input.Key.Up:
if (Keyboard.Modifiers == ModifierKeys.Shift)
i += GetDoubleValue(t);
else
i += GetSingleValue(t);
break;
case System.Windows.Input.Key.Down:
if (Keyboard.Modifiers == ModifierKeys.Shift)
i -= GetDoubleValue(t);
else
i -= GetSingleValue(t);
break;
case System.Windows.Input.Key.PageUp:
i += GetTripleValue(t);
break;
case System.Windows.Input.Key.PageDown:
i -= GetTripleValue(t);
break;
default:
return;
}
if (BindingOperations.IsDataBound(t, TextBox.TextProperty))
{
try
{
Binding binding = BindingOperations.GetBinding(t, TextBox.TextProperty);
t.Text = (string)binding.Converter.Convert(i, null, binding.ConverterParameter, binding.ConverterCulture);
}
catch
{
t.Text = i.ToString();
}
}
else
t.Text = i.ToString();
}
}
}

I decided to simplify the reply marked as the answer on here to basically 2 lines using a LINQ expression.
e.Handled = !e.Text.All(Char.IsNumber);
base.OnPreviewTextInput(e);

Why don't you just try using the KeyDown event rather than the PreviewKeyDown Event. You can stop the invalid characters there, but all the control characters are accepted. This seems to work for me:
private void NumericKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
bool isNumPadNumeric = (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9);
bool isNumeric =((e.Key >= Key.D0 && e.Key <= Key.D9) && (e.KeyboardDevice.Modifiers == ModifierKeys.None));
bool isDecimal = ((e.Key == Key.OemPeriod || e.Key == Key.Decimal) && (((TextBox)sender).Text.IndexOf('.') < 0));
e.Handled = !(isNumPadNumeric || isNumeric || isDecimal);
}

I use a custom ValidationRule to check if text is numeric.
public class DoubleValidation : ValidationRule
{
public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
{
if (value is string)
{
double number;
if (!Double.TryParse((value as string), out number))
return new ValidationResult(false, "Please enter a valid number");
}
return ValidationResult.ValidResult;
}
Then when I bind a TextBox to a numeric property, I add the new custom class to the Binding.ValidationRules collection. In the example below the validation rule is checked everytime the TextBox.Text changes.
<TextBox>
<TextBox.Text>
<Binding Path="MyNumericProperty" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<local:DoubleValidation/>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>

public class NumericTextBox : TextBox
{
public NumericTextBox()
: base()
{
DataObject.AddPastingHandler(this, new DataObjectPastingEventHandler(CheckPasteFormat));
}
private Boolean CheckFormat(string text)
{
short val;
return Int16.TryParse(text, out val);
}
private void CheckPasteFormat(object sender, DataObjectPastingEventArgs e)
{
var isText = e.SourceDataObject.GetDataPresent(System.Windows.DataFormats.Text, true);
if (isText)
{
var text = e.SourceDataObject.GetData(DataFormats.Text) as string;
if (CheckFormat(text))
{
return;
}
}
e.CancelCommand();
}
protected override void OnPreviewTextInput(System.Windows.Input.TextCompositionEventArgs e)
{
if (!CheckFormat(e.Text))
{
e.Handled = true;
}
else
{
base.OnPreviewTextInput(e);
}
}
}
Additionally you may customize the parsing behavior by providing appropriate dependency properties.

Combining the ideas from a few of these answers, I have created a NumericTextBox that
Handles decimals
Does some basic validation to ensure any entered '-' or '.' is valid
Handles pasted values
Please feel free to update if you can think of any other logic that should be included.
public class NumericTextBox : TextBox
{
public NumericTextBox()
{
DataObject.AddPastingHandler(this, OnPaste);
}
private void OnPaste(object sender, DataObjectPastingEventArgs dataObjectPastingEventArgs)
{
var isText = dataObjectPastingEventArgs.SourceDataObject.GetDataPresent(System.Windows.DataFormats.Text, true);
if (isText)
{
var text = dataObjectPastingEventArgs.SourceDataObject.GetData(DataFormats.Text) as string;
if (IsTextValid(text))
{
return;
}
}
dataObjectPastingEventArgs.CancelCommand();
}
private bool IsTextValid(string enteredText)
{
if (!enteredText.All(c => Char.IsNumber(c) || c == '.' || c == '-'))
{
return false;
}
//We only validation against unselected text since the selected text will be replaced by the entered text
var unselectedText = this.Text.Remove(SelectionStart, SelectionLength);
if (enteredText == "." && unselectedText.Contains("."))
{
return false;
}
if (enteredText == "-" && unselectedText.Length > 0)
{
return false;
}
return true;
}
protected override void OnPreviewTextInput(System.Windows.Input.TextCompositionEventArgs e)
{
e.Handled = !IsTextValid(e.Text);
base.OnPreviewTextInput(e);
}
}

You can also try using data validation if users commit data before you use it. Doing that I found was fairly simple and cleaner than fiddling about with keys.
Otherwise, you could always disable Paste too!

My Version of Arcturus answer, can change the convert method used to work with int / uint / decimal / byte (for colours) or any other numeric format you care to use, also works with copy / paste
protected override void OnPreviewTextInput( System.Windows.Input.TextCompositionEventArgs e )
{
try
{
if ( String.IsNullOrEmpty( SelectedText ) )
{
Convert.ToDecimal( this.Text.Insert( this.CaretIndex, e.Text ) );
}
else
{
Convert.ToDecimal( this.Text.Remove( this.SelectionStart, this.SelectionLength ).Insert( this.SelectionStart, e.Text ) );
}
}
catch
{
// mark as handled if cannot convert string to decimal
e.Handled = true;
}
base.OnPreviewTextInput( e );
}
N.B. Untested code.

Add this to the main solution to make sure the the binding is updated to zero when the textbox is cleared.
protected override void OnPreviewKeyUp(System.Windows.Input.KeyEventArgs e)
{
base.OnPreviewKeyUp(e);
if (BindingOperations.IsDataBound(this, TextBox.TextProperty))
{
if (this.Text.Length == 0)
{
this.SetValue(TextBox.TextProperty, "0");
this.SelectAll();
}
}
}

Call me crazy, but why not put plus and minus buttons at either side of the TextBox control and simply prevent the TextBox from receiving cursor focus, thereby creating your own cheap NumericUpDown control?

private void txtNumericValue_PreviewKeyDown(object sender, KeyEventArgs e)
{
KeyConverter converter = new KeyConverter();
string key = converter.ConvertToString(e.Key);
if (key != null && key.Length == 1)
{
e.Handled = Char.IsDigit(key[0]) == false;
}
}
This is the easiest technique I've found to accomplish this. The down side is that the context menu of the TextBox still allows non-numerics via Paste. To resolve this quickly I simply added the attribute/property: ContextMenu="{x:Null}" to the TextBox thereby disabling it. Not ideal but for my scenario it will suffice.
Obviously you could add a few more keys/chars in the test to include additional acceptable values (e.g. '.', '$' etc...)

Private Sub Value1TextBox_PreviewTextInput(ByVal sender As Object, ByVal e As TextCompositionEventArgs) Handles Value1TextBox.PreviewTextInput
Try
If Not IsNumeric(e.Text) Then
e.Handled = True
End If
Catch ex As Exception
End Try
End Sub
Worked for me.

Can you not just use something like the following?
int numericValue = 0;
if (false == int.TryParse(yourInput, out numericValue))
{
// handle non-numeric input
}

void PreviewTextInputHandler(object sender, TextCompositionEventArgs e)
{
string sVal = e.Text;
int val = 0;
if (sVal != null && sVal.Length > 0)
{
if (int.TryParse(sVal, out val))
{
e.Handled = false;
}
else
{
e.Handled = true;
}
}
}

Can also use a converter like:
public class IntegerFormatConverter : IValueConverter
{
public object Convert(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
int result;
int.TryParse(value.ToString(), out result);
return result;
}
public object ConvertBack(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
int result;
int.TryParse(value.ToString(), out result);
return result;
}
}

We Keep Coding

C# (C-Sharp) is a programming language developed by Microsoft that runs on the .NET Framework.

MaxLength Property breaks in my custom TextBox - c#

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To check if var is String type

Numeric Data Entry in WPF

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