GridView DropDownList列. [英] GridView DropDownList column.

问题描述

大家好，我有一个以实体模型为后端的Web应用程序.我在gridview中将设置设置为Edit | Update | Delete设置为true.我有一个单独的表，用于存储要填充记录中特定列的选项列表.在编辑模式下，有没有办法制作DropDownList?我将属性AutoGenerateColumns设置为true.

我明白了-部分.因此，请勿使用AutoGenerateColumns，并在DataView的列集合中的每个列中添加适当的字段.为下拉列表创建一个新的entityDatasource，并将其链接到TemplateField.现在的问题是要了解此模型的编辑部分.当我尝试在下拉列表中选择一个成员时，它不会更新，并且当我尝试更新任何其他字段时，我得到一个错误.如何使用此设置修复更新语句?

Hi all, I have a web application with entity model as backend. I have the settings set to Edit|Update|Delete set to true in the gridview. I have a separate table for storing a list of choices that I want to fill a certain column in the records. Is there a way to make a DropDownList while in edit mode? I have the property AutoGenerateColumns to true.

I got it - partly. So do not use AutoGenerateColumns and add each column in the column''s collection in the DataView with the appropriate fields. Create a new entityDatasource for the dropdownlist and link it to the TemplateField. The problem now is to understand the edit part of this model. When I try to select a member in the dropdownlist it does not update and when I try to update any other fields I get an error. How do I fix the update statements with this setup?

推荐答案

在这里，请看一下我们如何从下拉菜单中获得有关如何接线的想法正常工作: MSDN:演练:编辑时显示下拉列表在GridView Web服务器控件中 [ ^ ]

Here, have a look at it how we have dropdown in genral to get the idea on how things are wired up and work: MSDN: Walkthrough: Displaying a Drop-Down List While Editing in the GridView Web Server Control[^]

这是工作模型:

Here''s the working model:

Sub dgv_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles dgv.RowDataBound
   If e.Row.RowState = DataControlRowState.Edit Then
     Dim md As Med = CType(e.Row.DataItem, Med)
     Dim _type As String = md.DType
     Dim ddl As DropDownList = CType(e.Row.FindControl("ddlDType"), DropDownList)
     Dim item As ListItem = ddl.Items.FindByText(_type)
     ddl.SelectedIndex = ddl.Items.IndexOf(item)
   End If
 End Sub

 Sub dgv_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs) Handles dgv.RowUpdating
   Dim row As GridViewRow = dgv.Rows(dgv.EditIndex)
   Dim list As DropDownList = CType(row.FindControl("ddlDType"), DropDownList)
   e.NewValues("DType") = list.SelectedValue
 End Sub

 Private Sub dgv_RowEditing(sender As Object, e As GridViewEditEventArgs) Handles dgv.RowEditing
   If Not dgv.EditIndex = -1 Then
     Try
       Dim row As GridViewRow = dgv.Rows(dgv.EditIndex)
       Dim ddl As DropDownList = CType(row.FindControl("ddlDType"), DropDownList)
       ddl.SelectedIndex = ddl.Items.IndexOf(ddl.Items.FindByText(CType(row.DataItem, Med).DType))
     Catch
     End Try
   End If
 End Sub

<asp:TemplateField  HeaderText="DType" >
    <ItemTemplate >
       <asp:Label ID="lbDT" Text='<%# Bind("DType")%>' runat="server" ></asp:Label>
    </ItemTemplate>
    <EditItemTemplate >
       <asp:DropDownList ID="ddlDType" DataSourceID="edsDDL" DataTextField="types" DataValueField="types" runat="server" ></asp:DropDownList>
    </EditItemTemplate>
</asp:TemplateField>

这篇关于GridView DropDownList列.的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！