Common problems with DataGrid

datagrid| problem when we first contact the DataGrid, may not be familiar with it, and sometimes some common settings will let you worry for a long time, in view of this, I summed up its more common usage, I hope to have just contact the DataGrid people some help.

A pair of each column to make some settings, here we have a certain understanding of the DataGrid column, its columns can be divided into two types, DataGridTextBoxColumn and DataGridBoolColumn. Of course you can also add the style of your own column, as long as you inherit DataGridColumnStyle (and of course rewrite some methods).

Here's a piece of code:

DataGridTableStyle style=new DataGridTableStyle ();

Style. Mappingname=ds. Tables[0]. Tablename.tostring ();



DataGridBoolColumn colu=new DataGridBoolColumn ();

Colu. Mappingname= "Isselect";//Map to a column of a table

Colu. Headertext= ""; Header Name of column

Colu. Truevalue= "Y"; The value of the tick

Colu. Falsevalue= "N";

Colu. width=40; Set the width of the column to be changed

Colu. Allownull=false; Null value not allowed

Colu. Readonly=true; Set the Change column to read-only

Style. Gridcolumnstyles.add (Colu);

The code above is to create a datagridboolcolumn column, which is a checkbox column, there are three states of the checkbox, True,false,null, you can set the Colu. Allownull=false; cancel the third State.

And look at a piece of code, which is creating DataGridTextBox columns

DataGridTextBoxColumn Col;

Col=new DataGridTextBoxColumn ();

Col. Mappingname= "DMINIMUMPV";

Col. headertext= "minimum cumulative performance";

Col. alignment=horizontalalignment.right;//the alignment of the column

Col. format= "#,###.00"; Set the format of the display

Col. width=90;

Style. Gridcolumnstyles.add (COL);

Believe that these two pieces of code should let you have the DataGrid column settings have a certain understanding of it!

Two capture the double click event in the DataGrid, it was a very simple question, but if you only write a program to the doubleclicked of the DataGrid, you will find a problem, in the cell of the DataGrid, double-click without reaction, This is because there is a textbox in the DataGrid, so you need to capture the doubleclicked event of the textbox, but when you complete this step, see how it works, and if you are careful, you will find a problem when the cursor is not in a cell, Double-click the cell and find out what? No reaction, did you double click, why? This is because the DataGrid decomposes this double-click operation, divided into two clicks, the first one to get the cell cursor, the second is to click the event, so your double-click will not respond, so we have to do is to take this action as a double-click event to deal with, so as to achieve our goal. So capturing a double click event will do three things. Here's a piece of code.

First step:

private void Dgrole_doubleclick (Object Sender,system.eventargs e)

Dgrole for the DataGrid



{

This.frmrolerightshow (); We double click on the thing to do

}

Step Two:

private void Textbox_doubleclick (Object Sender,system.eventargs e)

{

This.frmrolerightshow ();

}

Step Three:

DateTime Gridmousedowntime;

private void Dgrole_mousedown (Object Sender,system.windows.forms.mouseeventargs e)

{

Gridmousedowntime=datetime.now; Record time

}

private void Textbox_mousedown (Object Sender,mouseeventargs e)

{

if (DateTime.Now < Gridmousedowntime.addmilliseconds (systeminformation.doubleclicktime))

If the time of two clicks is less than the double-click time of the system, we think of it as a double click operation

{

This.frmrolerightshow ();

}

}

How do I get the value of a cell? One line of code, as follows:

String Strrole=dgrole[row,column]. ToString ();

The above is I through see csdn on the post and in practice summed up, if you have any experience of the use of the DataGrid, you might as well write it out and share with you.