解释DataControlRowType只是不了解它. [英] Explain DataControlRowType Just don't understand it.

问题描述

嗨
我已经阅读了所有教程，就像过去12个小时我一直在阅读法语一样，我嵌套了gridview，孩子需要从父母那里获取值我已经走了这么远，请仔细阅读我的代码并将我的位置更正我错了.

Hi
I''ve read all the tutorials Its like I''ve been reading french for the Past 12 hours I have nested gridviews which the child needs to get values from parent I''ve come this far please review my code and correct me where I am wrong.

<asp:GridView ID="GrdJobSht" runat="server" AutoGenerateColumns="False" DataSourceID="GetJobSheetDATA" OnRowDataBound="GrdJobSht_RowDataBound">
<Columns>
<asp:TemplateField>
<ItemTemplate>  
<table><tr><td rowspan="5" class="style4">
<asp:Image ID="ProdImage" runat="server" Height="152px" 

ImageUrl='<%# String.Format(ResolveUrl("ProductImage.ashx")+"{0}{1}","?id=",Eval("propImageId")) %>'

style="margin-left: 0px" Width="172px" BorderColor="Silver" 

 BorderStyle="Double" BorderWidth="10pt" /> 
</td></tr><tr><td class="style5">
<asp:Label ID="Label1" runat="server" Text="Product ID:" Font-Italic="True" 

Font-Names="Times New Roman" Font-Size="Medium"></asp:Label>
</td><td>
 <asp:Label ID="lblProdid" runat="server" Text='<%# Eval("propProdId") %>'></asp:Label>
</td></tr><tr><td class="style5">
<asp:Label ID="Label2" runat="server" Text="Description:" Font-Italic="True" 

                                    Font-Names="Times New Roman" Font-Size="Medium"></asp:Label>
</td><td>
 <asp:Label ID="lblDesc" runat="server" Text='<%# Eval("propProdDesc") %>'></asp:Label>
</td></tr><tr><td class="style5">
<asp:Label ID="Label3" runat="server" Text="Quantity:" Font-Italic="True" 

    Font-Names="Times New Roman" Font-Size="Medium"></asp:Label>
</td><td>
 <asp:Label ID="lblQty" runat="server" Text=  '<%# Eval("propProdQty") %>'></asp:Label>
</td></tr><tr>
<td class="style5">
<asp:Label ID="Label4" runat="server" Text="Colour:" Font-Italic="True" 

       Font-Names="Times New Roman" Font-Size="Medium"></asp:Label>
</td><td>
 <asp:Label ID="lblColor" runat="server" Text='<%# Eval("propColour") %>'></asp:Label>
</td></tr><tr><td class="style5">
<asp:Label ID="Label5" runat="server" Text="Def Design:" Font-Italic="True" 

  Font-Names="Times New Roman" Font-Size="Medium"></asp:Label>
</td><td>
<asp:Label ID="lblDefDes" runat="server" Text='<%# Eval("propDeflectionDesign") %>'></asp:Label>
</td></tr></table>                                                                   
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
Measurements
</HeaderTemplate>
<ItemTemplate>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="obsMeas">
<Columns>
<asp:BoundField DataField="propWidth" HeaderText="propWidth" SortExpression="propWidth" />
<asp:BoundField DataField="propHeight" HeaderText="propHeight" SortExpression="propHeight" />
<asp:BoundField DataField="ProprodId" HeaderText="ProprodId" SortExpression="ProprodId" />
</Columns>
</asp:GridView>
<asp:ObjectDataSource ID="obsMeas" runat="server" SelectMethod="getProdMeasurements" TypeName="BusinessLogicLayer.Measurements" OldValuesParameterFormatString="original_{0}">
<SelectParameters>
<asp:Parameter Name="qno" Type="Int32" />
<asp:Parameter Name="id" Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

这就是我添加参数的方式，但是它以某种方式返回false，我不应该这样，因为如果没有嵌套的Gridview，主数据库将被适当地填充

And this is how I add the parameters but somehow it returns false which shouldn''t be the case I think because without the nested Gridview the master database gets populated appropriately

protected void GrdJobSht_RowDataBound(object sender, GridViewRowEventArgs e)
{
 if (e.Row.RowType == DataControlRowType.DataRow)//returns false hence does not execute code inside
  {
   SqlDataSource s = (SqlDataSource)e.Row.FindControl("obsMeas");
   s.SelectParameters[0].DefaultValue = DDlQno.Text;
   s.SelectParameters[1].DefaultValue = ((Label)e.Row.FindControl("lblProdid")).Text;
  }
}

推荐答案

首先，您做错了.

1st of all , you are doing it wrong .

<asp:objectdatasource id="obsMeas" runat="server" selectmethod="getProdMeasurements" xmlns:asp="#unknown">
</asp:objectdatasource>

此"obsMeas"控件位于网格视图的外部，您正在尝试通过((SqlDataSource)e.Row.FindControl("obsMeas");"进行访问.在GridView的数据边界中，我认为这是不可能的.

看看这个代码示例，

This "obsMeas" Control is present out side the grid view, and you are trying to access it by "(SqlDataSource)e.Row.FindControl("obsMeas");" in side GridView''sData Bound, which I think is not possible.

Have a look at this Code Sample,

<asp:templatefield headertext="HeaderText">
   <itemtemplate>
      <asp:label id="lbl" runat="server"></asp:label>
   </itemtemplate>
</asp:templatefield>

//--CodeBehind
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
    DataRow dr = ((DataRowView)e.Row.DataItem).Row;
    if(dr["ColumnName"].ToString() == "1" )
    {
      ((Label)e.Row.FindControl("lbl")).Text = "A";
    }
    else if(dr["ColumnName"].ToString() == "2" )
    {
      ((Label)e.Row.FindControl("lbl")).Text = "B";
    }
     ................
      ................
   }
}

通过此MSDN链接获取 GridView.RowDataBound事件

Go through this MSDN link for GridView.RowDataBound Event

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