Question

我知道这个话题已被覆盖很多，但我无法找到解决问题的方法。

我已尝试使用SqlDataSource使用以下指南创建字段绑定，但我按照每个步骤进行操作，最后字段绑定的选项显示为灰色。 https://msdn.microsoft.com/en-us/library/ms178294.aspx

所以我开始试图将DropDownList编码到GridView中，但我目前没有在DDL中生成任何数据。不知道下一步要添加什么。

下面是我的GridView代码，我正在尝试让ddlCategory显示我的类别表中的所有类别。

<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>

这是我用来获取GridView数据的SQL语句：

SELECT Files.FileID, Files.CategoryID, Files.Filename, Files.Description,
       Files.IsPublished, Files.IsArchived, Categories.Description AS Category 
FROM Files INNER JOIN Categories ON Files.CategoryID = Categories.CategoryID

提前致谢！

Answer 1

我有类似的斗争，你需要沿着这些行使用某些东西private void BindDropDownList（）

        DataView dv = mgr.GetItemSeriesMaster().DefaultView; //how to filter data
        dv.RowFilter = ProductQueryFilter;
        Dropdownlist1.DataSource = dv;

        Dropdownlist1.DataTextField = "Description"; // the items to be displayed in the list items
        Dropdownlist1.DataValueField = "Id"; // the id of the items displayed
        Dropdownlist1.DataBind();

Answer 2

我的建议如下：创建一个从DataBase返回DataSet的方法，如下所示：

<link rel="stylesheet" href="{% static 'labelcreator/css/overview_edit_master.css' %}">
    <div class="container">
        <div class="row">
            <div class="col-lg-12">
                <form class="form-horizontal" method="POST">
                      {% csrf_token %}
                      <div class="form-group" id="productGroup">
                          <label for="inlineFormCustomSelectPref">Choose Product...</label>
                          {{ form.as_p }}
                      </div>
                      <div class="form-group">
                         <button type="submit" class="btn btn-primary my-1 pull-right">Create 
Label</button>
                     </div>
                </form>
            </div>
        </div>
    </div>

将GridView绑定到您的数据SOURce，如：

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;
        }
    }
}
}

gridview的GridView1_RowDataBound事件如下所示：

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

Answer 3

你可以使用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();
}
}

数据绑定GridView中的DropDownList

3 个答案: