C＃的形式与对照结合的datagridview到数据表 [英] c# binding datagridview to datatable in form vs control

问题描述

我有以下的code：

 的DataGridView lGrid =新的DataGridView（）;
        BindingSource的_bind =新的BindingSource（）;
        数据表表=新的DataTable（）;        this.Controls.Add（lGrid）;
        lGrid.AutoGenerateColumns = TRUE;
        清单＆LT;串GT; ColumnsNames =新的List＆LT;串GT;（）;
        ColumnsNames.Add（ID）;
        ColumnsNames.Add（NAME）;        的foreach（在ColumnsNames字符串名称）
            Table.Columns.Add（姓名）;        山坳的DataColumn = Table.Columns [ID];
        DataColumn的[]键=新的DataColumn [1];
        键[0] = Table.Columns [ID];
        Table.PrimaryKey =键;        lGrid.DataSource = _bind;
        _bind.DataSource =表;        INT I = lGrid.Columns.Count;
 

该填充lGrid在数据表中的列只是这个code形式的构造函数执行罚款。然而，当我将它移动到控制构造绑定不工作，我= 0，为什么会这样，我可以做些什么呢？

UPDATE1

确定。构造函数是最简单的

公共部分Form1类：表格
    {

 公共Form1中（）
    {
          的InitializeComponent（）;
         // code GOES HERE
    }
}
 

VS

 公共类mycontrol：控制
{
    公共mycontrol（）
    {
        // code GOES HERE
    }
}
公共部分Form1类：表格
{    公共Form1中（）
    {
          的InitializeComponent（）;          mycontrol LL =新mycontrol（）;
          this.Controls.Add（Ⅱ）;
    }
}
 

解决方案

使用想如果你

  lDataGrid.Bind（）;
 

那么你会得到伯爵（）

或检查的AfterDataBinding事​​件计数。

I have the following code:

        DataGridView lGrid = new DataGridView();
        BindingSource _bind = new BindingSource();
        DataTable Table = new DataTable();

        this.Controls.Add(lGrid);
        lGrid.AutoGenerateColumns = true;


        List<string> ColumnsNames = new List<string>();
        ColumnsNames.Add("ID");
        ColumnsNames.Add("NAME");

        foreach (string Name in ColumnsNames)
            Table.Columns.Add(Name);

        DataColumn col = Table.Columns["ID"];
        DataColumn[] keys = new DataColumn[1];
        keys[0] = Table.Columns["ID"];
        Table.PrimaryKey = keys;

        lGrid.DataSource = _bind;
        _bind.DataSource = Table;

        int i = lGrid.Columns.Count;

which populates lGrid with columns in datatable just fine with this code executing in the form constructor. However, when I move it to the control constructor binding doesn't work and i = 0. Why is it so and what can i do about it?

Update1

OK. the constructors are the most simple

public partial class Form1 : Form {

    public Form1()
    {
          InitializeComponent();
         //CODE GOES HERE
    }
}

VS

public class mycontrol : Control
{
    public mycontrol()
    {
        //CODE GOES HERE
    }
}


public partial class Form1 : Form
{

    public Form1()
    {
          InitializeComponent();

          mycontrol ll = new mycontrol();
          this.Controls.Add(ll);
    }
}

解决方案

Use think if you

lDataGrid.Bind();

then you will get the Count()

or check the Count on the AfterDataBinding Event.

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