I can't find how to do it.
I would like the number to be displayed three decimal places.
But to be remembered the whole number.
Example: full number: 8658,645851243511447358350.
Only display in TextBox: 8658,646
How should I do it?
The point is that in the program code read number from TextBox was whole: 8658,645851243511447358350.
I apologize if there is this solution somewhere. C# WinForms.
if this helps, you can use the "tag" property to store the full value, i.e.
TextBox.Text = "8658,646"
TextBox.Tag = "8658,645851243511447358350"
I got a workaround and that is to create your own class and that add additional property i.e., FullValue and keep track of both formatted and full value.
public class CustomTextBox:TextBox{
public string FullValue{get;set;}
}
or you can do
public class CustomTextBox:TextBox{
private string _FullValue;
public string FullValue{get=>_FullValue;set{base.Text=value;_FullValue=value;}}
}
Related
This question already has answers here:
Find control by name from Windows Forms controls
(3 answers)
Closed 3 years ago.
I have form1 and class1.
I would like to use a method to read/write the text in a textbox in form1 at class1.
This is the segment of the program. I currently able to interact between those two. The only problem is I do not how to convert the string to a form which can be read.
In form1:
public string readTxt(string txtbox_name)
{
string txtbox_val;
txtbox_val = (txtbox_name).Text; //problem here
return txtbox_val;
}
public void writeTxt(string txtbox_name,string txtbox_val)
{
(txtbox_name).Text = txtbox_val; //problem here
}
For example i need to read/write value in textbox1.
In class1:
string text1 = (readTxt(textbox1)); //for get the text in textbox1
string text2 = "Hello"
writeTxt(textbox1,text2); //for overwrite the text in textbox1 to "Hello"
Sorry for the question quite confusing due to not good in ask question.
For winforms, you could use Control.ControlCollection.Find(String, Boolean)
Searches for controls by their Name property and builds an array of
all the controls that match.
and Enumerable.OfType(IEnumerable)
Filters the elements of an IEnumerable based on a specified type.
public string ReadText(string txtbox_name)
{
// insert false if you expect not to be in a sub control
return Controls.Find(txtbox_name,true)
.OfType<TextBox>()
.FirstOrDefault()?.Text
}
However i fear your problem is actually, how can i get text from my TextBox.
var text = MyControl.Text;
Update
How about if i would like to write into Textbox.
var textBox = Controls.Find(txtbox_name,true)
.OfType<TextBox>()
.FirstOrDefault();
if(textBox != null)
textBox.Text = "yehaa";
Clarification
The difference between calling Find, and the other approaches, is that if your Textbox is buried in a Panel or other SubControls the other approaches wont find it. Other than that, they are exactly the same. Find works on the second parameter flag, and I'd an option to search subcontrols
searchAllChildren
true to search all child controls; otherwise, false.
You could Search for all TextBox with the name and get the Text using the Controls Property.
For Example,
public string ReadText(string txtbox_name)
{
return Controls.OfType<TextBox>().Single(x => x.Equals(txtbox_name)).Text;
}
I have a DataGridViewTextBoxColumn which is binded to a property. I want to allow user to input numbers no matter what he uses to separate decimals. Also I don't need spaces or commas to separate thousads.
It's simple:
1.908 = 1.908
1,908 = 1.908
And if there is no way to specify format string, can i Replace(",",".") before binding? Or any other way?
Thank you. (Sorry for my English)
Crete another property of String type which will be bounded to that column.
Then set/read value of original property through this
public class YourBindableItem
{
public decimal OriginalValue { get; set; }
public decimal ParsedValue
{
get { return this.OriginalValue.ToString(); }
set
{
string forParse =
value.Replace(",", Globalization.CultureInfo.InvariantCulture.NumberFormat.NumberDecimalSeparator);
decimal temp = 0;
if(decimal.TryParse(forParse,
out temp,
Globalization.CultureInfo.InvariantCulture) == true)
{
this.OriginalValue = temp;
}
//if value wasn't parsed succesfully, original value will be returned
this.RaiseOnPropertyChanged(nameOf(this.ParsedValue));
}
}
}
The DataGridView already formats according to the regional settings for the current user, at least if you data bind to an object data source and the property is numeric (i.e. not a string).
You can test this by opening Region and Language in Windows and switching between e.g. the English (United States) format and Swedish (Sweden). In the former case, the input 2.718 will parse correctly while in the second 2,718 will. You'll have to run without debugging in VS in order to load fresh settings.
(I would not suggest trying to parse both comma and dot as a decimal separator for the same user, if you're thinking of doing that. That's not the expected behavior for most users and it would lead to bugs if the user should happen to use the thousand separator too.)
I'm parsing a tab delimited file using FileHelpers.
The null values are being ignored after using the FieldNullValue attribute and I am ending up with the error log
can't be found after the field 'filed name' at line 4 (the record has less fields, the delimiter is wrong or the next field must be marked as optional).
Class definition of delimiter:
[DelimitedRecord("\t")]
Fields are all strings with the same attributes:
[FieldTrim(TrimMode.Both)]
[FieldNullValue("NULL")]
[FieldQuoted('"', QuoteMode.OptionalForRead, MultilineMode.AllowForRead)]
public String initials;
Looking at the imported file in a hex editor i can see back to back tab chars (09 09) which would I assume be a null field.
As you can see in the screen capture fields 5 & 9 are null. These get ignored by the filehelper parser. Does anyone know why?
I think you have two problems going on.
Firstly, FileHelpers is expecting one more tab. One easy fix is to mark the last field with the [FieldOptional] attribute.
Secondly, FieldNullValue("NULL") means: If the value of the field in the file is null, set it to the string "NULL". The value in your file is "", not null. If you need to convert empty values to something else, you can use a custom converter as follows:
public class MyEmptyFieldConverter : ConverterBase
{
protected override bool CustomNullHandling
{
/// you need to tell the converter not
/// to handle empty values automatically
get { return true; }
}
public override object StringToField(string from)
{
if (String.IsNullOrWhiteSpace(from))
return "NULL";
return from;
}
}
And then add the attribute to your field.
[FieldConverter(typeof(MyEmptyFieldConverter))]
public string field9;
removing the attribute:
[FieldTrim(TrimMode.Both)]
Seems to have solved the problem.
I want to validate (in some simple way) if the input text for a textbox is a number, I would use this code: LINK
But here's a problem: I use .NET 4.0 not 4.5, so I don't havePreviewTextInput event.
I could use TextChanged, but now it doesn't have e.Handled validator.
Is there any simple solution for this (I want to avoid tons of code)?
If you have access to the property that will hold the value, you can use a DataAnnotation on the property.
[RegularExpression(Pattern="[0-9]+")]
public string MyProperty { get; set; }
This MSDN article goes abit more in depth about the subject.
It is difficult to determine what a number is and isn't. I would use TryParse. If it fails it's not a number.
string s = "12345";
int number;
bool result = int.TryParse(s, out number);
if(!result)
{
// not a number.
}
I have an app that allows user to input decimal values, like 00.000, 00.00, 0000.0 and so on.
The problem is that different users require different formats, and I'd like to offer a feature to configure this input format to the end users (like an input template or mask).
What do you think is the best approach to get this accomplished?
You can implement a custom IFormatProvider and use the Parse(string, IFormatProvider) Method to define how the decimals are going to be parsed.
See http://msdn.microsoft.com/de-de/library/t7xswkc6.aspx fpr Method description
See http://www.codeproject.com/KB/cs/custstrformat.aspx for a tutorial
/*
why not make your own method that checks the format length and do something like this as a starting point.
lets say the user typed in the following //replace the following with what ever you are checking against a textbox input.
//This is something that I have quickly written up to test the text that I am passing.
*/
tmpStringTest+= FormatNumberWithCommas(100.ToString()) + " ";
tmpStringTest += FormatNumberWithCommas(1000.ToString());
tmpStringTest += FormatNumberWithCommas(10000.ToString());
tmpStringTest += FormatNumberWithCommas(100000.ToString());
tmpStringTest += FormatNumberWithCommas(1000000.ToString());
public static string FormatNumberWithCommas(string inputString)
{
string tempString;
tempString = string.Format("{0:##,###,###}", Convert.ToInt32(inputString));
return tempString;
}