C# 在GridView中绑定DropDownList的数据

我知道这个话题已经讨论了很多，但我找不到解决问题的办法

我曾尝试使用SqlDataSource创建一个字段绑定，但我遵循了每一步，最后字段绑定选项变灰

所以我开始尝试将DropDownList编码到GridView中，但是我目前没有在DDL中生成任何数据。不确定下一步要添加什么

下面是我的GridView代码，我试图让DDLContegory显示我的category表中的所有类别

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
    DataKeyNames="FileID" DataSourceID="filenameTableDataSource"
    EnableModelValidation="True" Style="text-align: center">
    <Columns>
        <asp:CommandField ShowEditButton="True" />
        <asp:BoundField DataField="FileID" HeaderText="FileID" InsertVisible="False" ReadOnly="True" SortExpression="FileID" />
        <asp:BoundField DataField="Filename" HeaderText="Filename" SortExpression="Filename" />
        <asp:TemplateField HeaderText="Category" SortExpression="Category">
            <ItemTemplate>
                <asp:Label ID="Category" runat="server" Visible="false" />
                <asp:DropDownList ID="ddlCategory" runat="server">
                </asp:DropDownList>
            </ItemTemplate>
        </asp:TemplateField>
        <%-- <asp:BoundField DataField="Category" HeaderText="Category" SortExpression="Category" />--%>
        <asp:BoundField DataField="Description" HeaderText="Description" SortExpression="Description" />
        <asp:CheckBoxField DataField="IsPublished" HeaderText="IsPublished" SortExpression="IsPublished" />
        <asp:CheckBoxField DataField="IsArchived" HeaderText="IsArchived" SortExpression="IsArchived" />
    </Columns>
</asp:GridView>

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提前谢谢

我也遇到过类似的问题，您需要使用类似的东西private void BindDropDownList（）

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我的建议如下： 创建从数据库返回数据集的方法，如下所示：

private DataSet GetData(string query)
{
string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
SqlCommand cmd = new SqlCommand(query);
using (SqlConnection con = new SqlConnection(conString))
{
    using (SqlDataAdapter sda = new SqlDataAdapter())
    {
        cmd.Connection = con;
        sda.SelectCommand = cmd;
        using (DataSet ds = new DataSet())
        {
            sda.Fill(ds);
            return ds;
        }
    }
}
}

将GridView绑定到数据源，如：

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
    GridView1.DataSource = GetData("SELECT ContactName, Country FROM Customers");
    GridView1.DataBind();
}
}

gridview的on The GridView1_RowDataBound事件执行以下操作：

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
    //Find the DropDownList in the Row.
    DropDownList ddlCategory= (e.Row.FindControl("ddlCategory") as DropDownList);
    ddlCategory.DataSource = GetData("SELECT DISTINCT Country FROM Category");
    ddlCategory.DataTextField = "CategoryName";
    ddlCategory.DataValueField = "CategoryId";
    ddlCategory.DataBind();




}
}

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您可以使用OnRowDataBound事件：

protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{  
    DropDownList ddlCategory= (e.Row.FindControl("ddlCategory") as DropDownList);
    ddlCategory.DataSource = GetData("SELECT DISTINCT CategoryName,CategoryId FROM Categories");
    ddlCategory.DataTextField = "CategoryName";
    ddlCategory.DataValueField = "CategoryId";
    ddlCategory.DataBind();
}
}

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
    //Find the DropDownList in the Row.
    DropDownList ddlCategory= (e.Row.FindControl("ddlCategory") as DropDownList);
    ddlCategory.DataSource = GetData("SELECT DISTINCT Country FROM Category");
    ddlCategory.DataTextField = "CategoryName";
    ddlCategory.DataValueField = "CategoryId";
    ddlCategory.DataBind();




}
}

protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{  
    DropDownList ddlCategory= (e.Row.FindControl("ddlCategory") as DropDownList);
    ddlCategory.DataSource = GetData("SELECT DISTINCT CategoryName,CategoryId FROM Categories");
    ddlCategory.DataTextField = "CategoryName";
    ddlCategory.DataValueField = "CategoryId";
    ddlCategory.DataBind();
}
}