c# - 将 List 绑定(bind)到 asp.net 中的 Grid View 的一列

Question

例子:

<asp:GridView ID="reportScheduleDetailsGridView" runat="server" AutoGenerateColumns="False"  >                
                <Columns>
                    <asp:BoundField DataField="Name" HeaderText="Name" ></asp:BoundField>
                    <asp:BoundField DataField="Frequency" HeaderText="Frequency" ></asp:BoundField>
                    <asp:TemplateField HeaderText="Reports" >
                        <ItemTemplate>
                            <asp:Label ID="cblSubscribedReports" Text='<%# Eval("Reports") %>'  runat="server"/>
                        </ItemTemplate>
                        </asp:TemplateField>
                </Columns>
         </asp:GridView>

代码:

               DataTable table = new DataTable();
                table.Columns.Add("Name");
                table.Columns.Add("Frequency");
                table.Columns.Add("Reports");

                DataRow row1 = table.NewRow();
                row1["Name"] = "A";
                row1["Frequency"] = "Daily";
                    List<string> report1 = new List<string>();
                    report1.Add("XYZ");
                    report1.Add("ABC");
                    report1.Add("PQR");
                    row1["Reports"] = report1;
                table.Rows.Add(row1);

                DataRow row2 = table.NewRow();
                row2["Name"] = "B";
                row2["Frequency"] = "Weekly";
                    List<string> report2 = new List<string>();
                    report2.Add("XYZ");
                row2["Reports"] = report2;
                table.Rows.Add(row2);

                reportScheduleDetailsGridView.DataSource = table;
                reportScheduleDetailsGridView.DataBind();   

当我运行代码时，Reports 列显示 System.Collections.Generic 而不是字符串值

Name    Frequency       Reports
A           Daily         System.Collections.Generic.List`1[System.String] 
B           Weekly        System.Collections.Generic.List`1[System.String] 

我需要这样的输出:报告列应该显示字符串列表

Name    Frequency   Reports
A            Daily            1.XYZ
                          2.ABC
                          3.PQR
B           Weekly            1.XYZ

Answer 1

然后您应该指定 Reports 列的数据类型:

        DataTable table = new DataTable();
        table.Columns.Add("Name");
        table.Columns.Add("Frequency");
        table.Columns.Add("Reports", typeof(List<string>));

        DataRow row1 = table.NewRow();
        row1["Name"] = "A";
        row1["Frequency"] = "Daily";
        List<string> report1 = new List<string>();
        report1.Add("XYZ");
        report1.Add("ABC");
        report1.Add("PQR");
        row1["Reports"] = report1;
        table.Rows.Add(row1);

        DataRow row2 = table.NewRow();
        row2["Name"] = "B";
        row2["Frequency"] = "Weekly";
        List<string> report2 = new List<string>();
        report2.Add("XYZ");
        row2["Reports"] = report2;
        table.Rows.Add(row2);

        reportScheduleDetailsGridView.DataSource = table;
        reportScheduleDetailsGridView.DataBind();


<asp:GridView ID="reportScheduleDetailsGridView" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name"></asp:BoundField>
        <asp:BoundField DataField="Frequency" HeaderText="Frequency"></asp:BoundField>
        <asp:TemplateField HeaderText="Reports">
            <ItemTemplate>
                <asp:Repeater ID="Repeater1" runat="server" DataSource='<%# Eval("Reports") %>'>
                    <ItemTemplate>
                        <%# (Container.ItemIndex+1)+"."+ Container.DataItem  %><br />
                    </ItemTemplate>
                </asp:Repeater>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>