动态添加下拉列表在编辑上的datagridviewasp.Net上的代码

本文关键字：datagridviewasp Net 代码 编辑 添加 下拉列表 动态 | 更新日期: 2023-09-27 18:06:08

我正在做一个项目，只是为了添加一些东西，其中一个是在GridView上添加下拉列表，当他们按下一行的编辑按钮…遗憾的是，这些列是在数据库绑定之前的运行时添加的，而不是像我发现的所有示例那样在aspx页面上添加的，我在这里像这样:

private void SetColumnsGrid(GridView Grid)
    {
        BoundField Col = new BoundField();//1
        Col.HeaderText = "Name";
        Col.DataField = "Name";
        Col.HeaderStyle.Width = Unit.Pixel(100);
        Col.ReadOnly = true;
        Grid.Columns.Add(Col);
        Col = new BoundField(); //2
        Col.HeaderText = "User Type";
        Col.DataField = "UserType";
        Col.HeaderStyle.Width = Unit.Pixel(100);
        Grid.Columns.Add(Col);
        //Is ddl spected to be here as the TemplateField with the EditItemTemplate?
}

那么，我该怎么做呢?我只是找不到合适的方法。我应该处理哪些事件?

非常感谢

动态添加下拉列表在编辑上的datagridviewasp.Net上的代码

您可以使用几个选项。一种方法是使用模板，另一种方法是在创建行时手动添加控件。模板示例(这使用了一个复选框，但可以很容易地切换):

Public Class CheckBoxTemplate
    Implements ITemplate   
    Public Sub InstantiateIn(ByVal container As System.Web.UI.Control) Implements System.Web.UI.ITemplate.InstantiateIn
        Dim cb As CheckBox = New CheckBox()
        cb.ID = "someId"
        cb.AutoPostBack = True
        container.Controls.Add(cb)

    End Sub
End Class

在你的应用代码中，你创建gridview控件的地方:

    Dim gv As New GridView
    With gv
        .ID = "myGridView"
        .AutoGenerateColumns = False
        .DataKeyNames = New String() {"somePKID"}
        .GridLines = GridLines.Both
        .AllowSorting = False
        .AllowPaging = False
        .PageSize = numRows
        .Width = tableWidth
        .BorderColor = Drawing.ColorTranslator.FromHtml("#808080")
        .PagerSettings.Mode = PagerButtons.NextPrevious
        .PagerSettings.NextPageText = "Next"
        .PagerSettings.PreviousPageText = "Prev"
        .HeaderStyle.CssClass = foundUserHeadStyle
        .RowStyle.CssClass = foundUserEvenRows
        .AlternatingRowStyle.CssClass = foundUserOddRows
        .Columns.Clear()
        Dim SelectUserTF As New TemplateField
        With SelectUserTF
            .HeaderText = "Add"
            .ItemStyle.Wrap = False
            .ItemTemplate = New CheckBoxTemplate()
        End With
       .Columns.Add(SelectUserTF)
   End With

另一个选项是在create row事件中执行此操作:

     Protected Sub gv_rowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles myGridView.RowCreated
    Try
        Dim myDDL As New DropDownList
        Dim myCollection As New ListItemCollection
        With myCollection
            Dim newItem As New ListItem
            newItem.Text = "item 1"
            newItem.Value = "1"
            .Add(newItem)
        End With
        e.Row.Cells(0).Controls.Add(myDDL)
  Catch ex As Exception
    Finally
    End Try
end sub

如果有帮助或者有问题请告诉我

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