c#dropdownlist selectedindex在gridview集合中更改了第二个dropdownlist的selectedindex

我有一个gridview，其中有两个从db填充的DropDownList。一个是描述性名称，另一个是缩写名称。我需要完成以下工作：

protected void ddlAddLabTest_SelectedIndexChanged(object sender, EventArgs e)
{
   DropDownList ddlLabTest = (DropDownList)sender;
   GridViewRow row = (GridViewRow)ddlLabTest.NamingContainer;
   DropDownList ddlAddLabTestShortName = (DropDownList)row.FindControl("ddlAddShortname");

   ddlAddLabTestShortName.SelectedIndex = intSelectedIndex;
}

Unable to cast object of type 'System.Web.UI.WebControls.DataGridItem' to type 'System.Web.UI.WebControls.GridViewRow'.

当我在DDL1中选择一个项目时，我需要更改DDL2的所选索引以匹配，反之亦然

我在此处搜索并发现以下内容：

protected void ddlAddLabTest_SelectedIndexChanged(object sender, EventArgs e)
{
   DropDownList ddlLabTest = (DropDownList)sender;
   GridViewRow row = (GridViewRow)ddlLabTest.NamingContainer;
   DropDownList ddlAddLabTestShortName = (DropDownList)row.FindControl("ddlAddShortname");

   ddlAddLabTestShortName.SelectedIndex = intSelectedIndex;
}

Unable to cast object of type 'System.Web.UI.WebControls.DataGridItem' to type 'System.Web.UI.WebControls.GridViewRow'.

只有当到达“行”的分配时，我才会收到以下信息：

protected void ddlAddLabTest_SelectedIndexChanged(object sender, EventArgs e)
{
   DropDownList ddlLabTest = (DropDownList)sender;
   GridViewRow row = (GridViewRow)ddlLabTest.NamingContainer;
   DropDownList ddlAddLabTestShortName = (DropDownList)row.FindControl("ddlAddShortname");

   ddlAddLabTestShortName.SelectedIndex = intSelectedIndex;
}

Unable to cast object of type 'System.Web.UI.WebControls.DataGridItem' to type 'System.Web.UI.WebControls.GridViewRow'.

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我试着找到一个有效的例子，但我找不到。非常感谢您的帮助

似乎

NamingContainer

不是一行，所以请保持这样。它已经有了

FindControl

方法

var row = ddlLabTest.NamingContainer;

试试这个

protected void ddlAddLabTest_SelectedIndexChanged(object sender, EventArgs e)
{
   DropDownList ddlLabTest = (DropDownList)sender;
   DataGridItem row = (DataGridItem) ddlLabTest.NamingContainer;
   DropDownList ddlAddLabTestShortName = (DropDownList)row.FindControl("ddlAddShortname");

   ddlAddLabTestShortName.SelectedIndex = intSelectedIndex;
}

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您是否尝试过javascript解决方案，或者是否需要回发？如果DDL总是彼此相等，为什么两者都需要？尝试过：“无法将类型”System.Web.UI.Controls“隐式转换为”System.Web.UI.WebControls.GridViewRow“。存在显式转换（是否缺少转换？）”删除GridViewRow类型。使用变量。非常感谢！我不得不使用GridViewRow而不是DataGridItem，但它成功了！：）