关于在gridview中有dorpdownlist的情况下使用自带编辑模板的方法

今天记录一下在gridview中，如果有dropdownlist的情况下使用gridview自带编辑模式的方法。

好吧，今天的这个问题有点绕，详细解释一下目的。

因为gridview中的某些列的数据是从basedata里面带出来的，在编辑gridview的时候，user是想手动选择列值，而不是手动输入(输入不对的话，系统会报错)，以上是背景。

OK，想了想，在gridview中可以这样实现这个功能，用gridview自带的编辑模板，数据呈现用label绑定，数据编辑的时候用dropdownlist，下面贴出代码：

前台：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowCancelingEdit="GridView1_RowCancelingEdit"
                OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating"
                 OnRowDataBound="GridView1_RowDataBound">
                <Columns>
                    <asp:TemplateField HeaderText="category">
                        <ItemTemplate>
                            <asp:Label ID="label1" runat="server" Text='<%#Bind("category") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                            <asp:Label ID="label2" runat="server" Text='<%#Bind("category") %>' CssClass="hideColumn"></asp:Label>
                            <asp:DropDownList ID="drpCategory" runat="server" Width="156px">
                            </asp:DropDownList>
                        </EditItemTemplate>
                    </asp:TemplateField>
                    <asp:CommandField HeaderText="编辑" ShowEditButton="True" />
                    <asp:CommandField HeaderText="删除" ShowDeleteButton="True" />
                </Columns>
            </asp:GridView>

后台：

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindGridView();
        }
    }

    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        BindGridView();
    }
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {

    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {

    }
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView1.EditIndex = -1;
        BindGridView();
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow) 
        {
            int itest = e.Row.RowIndex;
            if (GridView1.EditIndex == 0)
            {
                Label label2 = (Label)e.Row.FindControl("label2");
                string strCategory = label2.Text.Trim();
                DropDownList drpCategory = (DropDownList)e.Row.FindControl("drpCategory");
                BindDropDownList(drpCategory,strCategory);
            }
        }
    }

    private void BindDropDownList(DropDownList drpCategory,string strCategory)
    {

        DataTable dt = new DataTable();
        dt.Columns.Add("category");
        drpCategory.DataSource = dt;
        drpCategory.DataBind();
        drpCategory.DataTextField = "category";
        drpCategory.DataValueField = "category";
        drpCategory.Items.Insert(0, new ListItem("请选择", "0"));
        drpCategory.Items.Insert(1, new ListItem("test1", "test1"));
        drpCategory.Items.Insert(2, new ListItem("test2", "test2"));
        drpCategory.Items.Insert(3, new ListItem("test", "test"));

        drpCategory.SelectedValue = strCategory;
    }

    private void BindGridView()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("category");
        //dt.Rows.Add(dt.NewRow());
        DataRow row = dt.NewRow();
        row["category"] = "test";
        dt.Rows.Add(row);
        this.GridView1.DataSource = dt;
        this.GridView1.DataBind();
    }

效果截图：

点击编辑

显示dropdownlist,并绑定了label的值

OK，写完啦，睡觉~明天周一继续努力！