I need to get the count of all cells in a DataTable, how can i do this ? I need this to verify that my 2 tables has the same cell amount before inserting data into a database.
Try this:
DataTable dt1 = new DataTable(), dt2 = new DataTable();
// define and populate your tables
int count1 = dt1.Columns.Count * dt1.Rows.Count;
int count2 = dt2.Columns.Count * dt2.Rows.Count;
bool verified = count1 == count2;
DataTable tbl = new DataTable();
foreach (DataRow row in tbl.Rows)
{
foreach (DataColumn col in tbl.Columns)
{
object cellData = row[col];
}
}
Related
I tried this solution below:
This Row already belongs to another table error when trying to add rows?
I have a Datatable that contains 597 Columns and 20 Rows and are trying to export the data to excel. However, Excel has a maximum column count 256 and so I need to divide the source data into 3 datatables to make the export work.
Below is the code I have written.
var dtmasterdata = data.Tables[name];
for (int j = 1; j < datatableNumberCount; j++)
{
DataTable dt2 = new DataTable();
dt2.TableName = "Master_" + j;
dt2 = dtmasterdata.Copy();
foreach (DataColumn col in dtmasterdata.Columns)
{
DataColumn dtcol = new DataColumn();
dtcol = col;
dt2.Columns.Add(dtcol.ColumnName, dtcol.DataType);
}
for (int k = 0; k < dtmasterdata.Rows.Count; k++)
{
DataRow dr = dt2.NewRow();
dr = dtmasterdata.Rows[k];
dt2.ImportRow(dtmasterdata.Rows[k]);
//dt2.Rows.Add(dr.ItemArray);
}
After that I need to delete few columns like below and I want to create 3 datatables
foreach (DataColumn col in dtmasterdata.Columns)
{
if (j == 1)
{
// condition 1
if (col.Ordinal >= 255)
{
dt2.Columns.RemoveAt(col.Ordinal);
}
}
if (j == 2)
{
// condition 2.
if (col.Ordinal < 255 || col.Ordinal >= 510)
{
dt2.Columns.RemoveAt(col.Ordinal);
}
}
if (j == 3)
{
// condition 3.
if (col.Ordinal <= 510 || col.Ordinal >= 765)
{
dt2.Columns.Add(col);
}
}
}
int worksheetNumber = 1;
string worksheetNameWithNumber = "Master Data";
if (worksheetNumber > 1)
worksheetNameWithNumber = String.Format("{0}_{1}", ws1, worksheetNumber.ToString());
Infragistics.Excel.Worksheet worksheet = wb.Worksheets.Add(worksheetNameWithNumber);
Infragistics.WebUI.UltraWebGrid.UltraWebGrid masterData1 = new Infragistics.WebUI.UltraWebGrid.UltraWebGrid("masterDataGrid");
masterData1.Browser = Infragistics.WebUI.UltraWebGrid.BrowserLevel.UpLevel;
masterData1.DataSource = dt2;
masterData1.DataMember = "Master_" + j;
masterData1.DisplayLayout.HeaderStyleDefault.Font.Bold = true;
masterData1.DisplayLayout.HeaderStyleDefault.Font.Name = "Arial";
masterData1.DisplayLayout.HeaderStyleDefault.Font.Size = FontUnit.Parse("10px");
masterData1.DisplayLayout.HeaderStyleDefault.BackColor = System.Drawing.Color.LightGray;
masterData1.DisplayLayout.RowStyleDefault.Font.Name = "Arial";
masterData1.DisplayLayout.RowStyleDefault.Font.Size = FontUnit.Parse("10px");
Infragistics.WebUI.UltraWebGrid.UltraGridBand masterBand1 = new Infragistics.WebUI.UltraWebGrid.UltraGridBand();
masterData1.Bands.Add(masterBand1);
dgResults.Controls.Add(masterData1);
masterData1.DataBind();
wb.ActiveWorksheet = worksheet;
this.ugWebGridExporter.Export(masterData1, worksheet);
worksheetNumber++;
Your error is because you are trying to add a column to a datatable that already belongs to your source datatable.
dt2.Columns.Add(col);
You can't just iterate through the columns of a datatable and add them to another.
I've a solution to this, which involves cloning the source data and removing what you don't need.
1st, make 3 clones of the datatables you need. Below is an example with me creating my own source table with 596 columns. Notice that clone only takes the data table structure, no data!
var source597ColsTable = new DataTable("Source");
for (var i = 0; i <= 596; i++)
{
source597ColsTable.Columns.Add(new DataColumn("Column" + i , typeof(string)));
}
DataRow newRow = source597ColsTable.NewRow();
source597ColsTable.Rows.Add(newRow);
var cols0To199Table = source597ColsTable.Clone();
var cols200To399Table = source597ColsTable.Clone();
var cols400To596Table = source597ColsTable.Clone();
Next copy all the rows from the source table into the clones. The below is a simple function to do so.
private DataTable CopyRowsFromSource(DataTable sourceTable, DataTable destinationTable)
{
foreach (DataRow row in sourceTable.Rows)
{
destinationTable.Rows.Add(row.ItemArray);
}
return destinationTable;
}
Then call this function for each of your tables.
cols0To199Table = CopyRowsFromSource(source597ColsTable, cols0To199Table);
cols200To399Table = CopyRowsFromSource(source597ColsTable, cols200To399Table);
cols400To596Table = CopyRowsFromSource(source597ColsTable, cols400To596Table);
Finally, remove all the columns from the datatables to give you your split.
private DataTable RemoveColumns(DataTable table, int startCol, int endCol)
{
var colsToRemove = new List<DataColumn>();
for (var colCount = startCol; colCount <= endCol; colCount++)
{
colsToRemove.Add(table.Columns[colCount]);
}
foreach (DataColumn col in colsToRemove)
{
table.Columns.Remove(col);
}
return table;
}
Then call.. again for each cloned table.
cols0To199Table = RemoveColumns(cols0To199Table, 200, 596);
cols200To399Table = RemoveColumns(cols200To399Table, 0, 199);
cols200To399Table = RemoveColumns(cols200To399Table, 200, 396);
cols400To596Table = RemoveColumns(cols400To596Table, 0, 399);
After running this, you will have 3 datatables, columns 0-199, 200-399 and 400-596.
Hope that helps.
I am not sure to have really understood all of your code, but to copy a subset of columns to another datatable there is a very simple method in the DataView class named ToTable where you can list the columns you want in the new table. As added bonus, this method copies also the data in the 20 rows of your original table.
So the only difficult is to list these columns to the method.
You can proceed in this way using linq over the DataColumn collection
string[] firstCols = dtmasterdata.Columns
.Cast<DataColumn>()
.Take(255)
.Select(x => x.ColumnName).ToArray();
string[] secondCols = dtmasterdata.Columns
.Cast<DataColumn>()
.Skip(255)
.Take(255)
.Select(x => x.ColumnName).ToArray();
string[] thirdCols = dtmasterdata.Columns
.Cast<DataColumn>()
.Skip(510)
.Select(x => x.ColumnName).ToArray();
DataTable t1 = dtmasterdata.DefaultView.ToTable("Master_1", false, firstCols);
DataTable t2 = dtmasterdata.DefaultView.ToTable("Master_2", false, secondCols);
DataTable t3 = dtmasterdata.DefaultView.ToTable("Master_3", false, thirdCols);
I have two DataTable, dt1, dt2. I write a class to compare two DataTable and get rows different.
table dt1:
Col 1 Col 2 Col 3
A 8 #
B 21 ()
table dt2:
Col 1 Col 2 Col 3
A 8 ^%^%^%
C 827 _++)
It show line different like:
B 21 ()
I post my function to compare:
public static DataTable CompareDataTables(DataTable first, DataTable second)
{
first.TableName = "FirstTable";
second.TableName = "SecondTable";
//Create Empty Table
DataTable table = new DataTable("Difference");
try
{
//Must use a Dataset to make use of a DataRelation object
using (DataSet ds = new DataSet())
{
//Add tables
ds.Tables.AddRange(new DataTable[] { first.Copy(), second.Copy() });
//Get Columns for DataRelation
DataColumn[] firstcolumns = new DataColumn[ds.Tables[0].Columns.Count];
for (int i = 0; i < 2; i++)
{
firstcolumns[i] = ds.Tables[0].Columns[i];
}
DataColumn[] secondcolumns = new DataColumn[ds.Tables[1].Columns.Count];
for (int i = 0; i < 2; i++)
{
secondcolumns[i] = ds.Tables[1].Columns[i];
}
//Create DataRelation
DataRelation r = new DataRelation(string.Empty, firstcolumns, secondcolumns, false);
ds.Relations.Add(r);
//Create columns for return table
for (int i = 0; i < first.Columns.Count; i++)
{
table.Columns.Add(first.Columns[i].ColumnName, first.Columns[i].DataType);
}
//If First Row not in Second, Add to return table.
table.BeginLoadData();
foreach (DataRow parentrow in ds.Tables[0].Rows)
{
DataRow[] childrows = parentrow.GetChildRows(r);
if (childrows == null || childrows.Length == 0)
table.LoadDataRow(parentrow.ItemArray, true);
}
table.EndLoadData();
}
}
catch (Exception ex) { }
return table;
}
tableDifferent will contain all rows different.
DataTable tableDifferent;
tableDifferent = CompareDataTables(dt1, dt2);
I tried with code:
var rowsToDelete = from r1 in dt1.AsEnumerable()
join r2 in tableDifferent.AsEnumerable()
on r1.Field<String>("StudentID") equals r2.Field<String>("StudentID")
select r1;
Now, I want to remove all rows in dt1 and dt2, only keep all rows in tableDifferent.
Have any method to do this?
If the only problem left is to clear the other data tables, you can use the DataTable.Clear Method ()
All rows in all tables are removed. An exception is generated if the
table has any enforced child relations that would cause child rows to
be orphaned.
If the DataSet is bound to an XmlDataDocument, calling DataSet.Clear
or DataTable.Clear raises the NotSupportedException. To avoid this
situation, traverse each table, removing each row one at a time. When
you use NewRow to create new rows, the rows must be processed before
you call Clear
In your case:
dt1.Clear();
dt2.Clear();
I have the following:
//a datatable with some rows and columns lets say 5x5
var datatable = new DataTable();
var numberofrows = datatable.rows.count;
for (int i = 0; i < numberofrows; i++) {
//for each row, get the 3rd column
var cell = datatable.rows[i].???
}
how do I get the 3rd column for each row?
for 3rd column
var cellValue = datatable.Rows[i][2];
better, if you know the column name,
var cellValue = datatable.Rows[i]["column_name"];
If the table contains 2 columns "Property" and "Value". Contents can be inserted as follows
table.Columns.Add("Property", typeof(string));
table.Columns.Add("Value", typeof(string));
table.Rows.Add("P1", "abc");
table.Rows.Add("P2", "xyz");
To retrive contents of specific column
foreach (DataRow row in table.Rows)
{
if (row["Property"].ToString() == "P1")
{
var value = row["Value"].ToString();
}
}
we can read the particular column values by like this
foreach (DataTable table in ds.Tables)
{
if (table.TableName == "Table1")
{
for (int j = 0; j < table.Rows.Count; j++)
{
int a = Convert.ToInt32( table.Rows[j].ItemArray[3]);
int b = Convert.ToInt32(table.Rows[j].ItemArray[4]);
}
}
}
You can iterate thru the datatable and get every row, which can be thought as an array, so you can pick each element of that particular row using an index (and can also use the name of the column instead of the index, i.e.: row["column3 name"]).
foreach(DataRow row in datatable)
{
Console.WriteLine(row[2]);
}
I created a list from an excel document that has partnumbers on the every other starting with the first, and prices on every other row, starting with the second.
Lets say I initialize a datatable like so..
DataTable priceListTable = new DataTable();
priceListTable.Columns.Add("ItemNumber", typeof(string));
priceListTable.Columns.Add("Price", typeof(Float));
And my list (called recordList) looks this;
001-001
1.45
001-002
3.49
How do I get the first two rows of the list to fill the columns of the dataTable?
Here's one solution.
Loop over the list 2 items at a time starting from the 2nd item. This makes sure you always have a pair of items to use.
for (int i = 1; i < list.Count; i += 2)
{
DataRow row = table.NewRow();
row["ItemNumber"] = list[i-1];
row["Price"] = list[i];
table.Rows.Add(row);
}
string ItemNumber = "ItemNumber";
string Price = "Price";
DataTable priceListTable = new DataTable();
DataRow row;
priceListTable.Columns.Add(ItemNumber);
priceListTable.Columns.Add(Price);
int counter = 0;
foreach(string s in recordList)
{
myTableSize++;
}
foreach(string s in recordList)
{
if (counter < myTableSize)
{
row = priceListTable.NewRow();
row[ItemNumber] = recordList[counter];
row[Price] = recordList[counter + 1];
priceListTable.Rows.Add(row);
counter++;
counter++;
}
I have an existing DataTable with thousand rows and want to find the rows and set it to become top rows.
I don't know if you're able to, but I would probably add a dummy column to sort by, give the rows you want a higher value in the dummy column, and then sort by the column from bigger to smaller with a DataView.
private void ModifyTable(DataTable toModify)
{ //Add a column to sort by later.
DataColumn col = toModify.Columns.Add("DummySort", typeof(int));
col.DefaultValue = 0;
}
private void SetDummyColumnValue(DataRow dr, int value)
{ //Mark the columns you want to sort to bring to the top.
//Give values bigger than 0!
dr["DummySort"] = value;
}
private DataTable GetSortedTable(DataTable modifiedTable)
{
//Sort by the column from bigger to smaller
DataView dv = new DataView(modifiedTable);
dv.Sort = "DummySort DESC"; return dv.ToTable();
}
You can try to remove and insert row
public void MoveDataRowTo(DataRow dataRow,int destination)
{
DataTable parentTable = dataRow.Table;
int rowIndex = parentTable.Rows.IndexOf(dataRow);
if (rowIndex > 0)
{
DataRow newDataRow = parentTable.NewRow();
for (int index = 0; index < dataRow.ItemArray.Length; index++)
newDataRow[index] = dataRow[index];
parentTable.Rows.Remove(dataRow);
parentTable.Rows.InsertAt(newDataRow, destination);
dataRow = newDataRow;
}
}
DataSet dsAct = new DataSet();
OleDbDataAdapter odaTem = new OleDbDataAdapter("SELECT ActivityId, Activity FROM tbl_Activity", ocnConn);
odaTem.Fill(dsAct, "Activity");
DataRow drTem;
int i = 0;
//Rows want set to be on top is in the table "TopActivity"
foreach (DataRow dr in dsAct.Tables["TopActivity"].Rows)
{
drTem = dsAct.Tables["Activity"].NewRow();
//Clone the row
drTem.ItemArray = dsAct.Tables["Activity"].Rows.Find(dr["Activity_ID"]).ItemArray;
dsAct.Tables["Activity"].Rows.RemoveAt( dsAct.Tables["Activity"].Rows.IndexOf( dsAct.Tables["Activity"].Rows.Find(dr["Activity_ID"])));
dsAct.Tables["Activity"].Rows.InsertAt(drTem, i);
i++;
}