Question

我用数据源填充了datagridview，我的SQL查询就在其中。我没有使用存储过程或类似的东西。它很好地显示数据但我无法使用gridview中的数据。例如，gridview1.selectedRow.cells[0].Text和类似的方法不起作用？有人可以帮我这个吗？

<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
    <h3>Gridview with Filtering</h3>
        <div class="GridviewDiv">
        <table style="width: 540px" border="0" cellpadding="0" cellspacing="1" class="GridviewTable">
            <tr >
                <td style="width: 40px;">
                    ID
                </td>
                <td style="width: 120px;" >
                    First Name
                </td>
                <td style="width: 120px;">
                    Last Name
                </td>
                <td style="width: 130px;">
                    Department
                </td>
                <td style="width: 130px;">
                    Location
                </td>
            </tr>
            <tr >
                <td style="width: 40px;">
                </td>
                <td style="width: 120px;">
                </td>
                <td style="width: 120px;">
                </td>
                <td style="width: 130px;">
                    <asp:DropDownList ID="ddldepartment" DataSourceID="dsPopulateDepartment" AutoPostBack="true"
                        DataValueField="department" runat="server" Width="120px" Font-Size="11px" AppendDataBoundItems="true">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                </td>
                <td style="width: 130px;">
                    <asp:DropDownList ID="ddlLocation" DataSourceID="dsPopulateLocation" AutoPostBack="true"
                        DataValueField="location" runat="server" Width="120px" Font-Size="11px" AppendDataBoundItems="true">
                        <asp:ListItem Text="All" Value="%"></asp:ListItem>
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
                <td colspan="5">
                    <asp:GridView ID="Gridview1" runat="server" AutoGenerateColumns="False" AllowPaging="True"
                        AllowSorting="true" DataSourceID="dsGridview" Width="540px" PageSize="10" CssClass="Gridview">
                        <Columns>
                            <asp:BoundField DataField="id" HeaderText="Sort" SortExpression="id" ItemStyle-Width="40px"
                                ItemStyle-HorizontalAlign="Center" />
                            <asp:BoundField DataField="FirstName" HeaderText="Sort" SortExpression="FirstName"
                                ItemStyle-Width="120px" />
                            <asp:BoundField DataField="LastName" HeaderText="Sort" SortExpression="LastName"
                                ItemStyle-Width="120px" />
                            <asp:BoundField DataField="Department" HeaderText="Sort" SortExpression="Department"
                                ItemStyle-Width="130px" />
                            <asp:BoundField DataField="Location" HeaderText="Sort" SortExpression="Location"
                                ItemStyle-Width="130px" />
                        </Columns>
                    </asp:GridView>
                </td>
            </tr>
        </table>
        </div>
        <asp:SqlDataSource ID="dsGridview" runat="server" ConnectionString="<%$ ConnectionStrings:EvonetConnectionString %>"
            SelectCommand="SELECT * FROM [T_Employees]" FilterExpression="Department like '{0}%'
            and Location like '{1}%'">
            <FilterParameters>
                <asp:ControlParameter Name="Department" ControlID="ddldepartment" PropertyName="SelectedValue" />
                <asp:ControlParameter Name="Location" ControlID="ddllocation" PropertyName="SelectedValue" />
            </FilterParameters>
        </asp:SqlDataSource>
        <asp:SqlDataSource ID="dsPopulateDepartment" runat="server" ConnectionString="<%$ ConnectionStrings:EvonetConnectionString %>"
            SelectCommand="SELECT DISTINCT Department from [T_Employees]"></asp:SqlDataSource>
        <asp:SqlDataSource ID="dsPopulateLocation" runat="server" ConnectionString="<%$ ConnectionStrings:EvonetConnectionString %>"
            SelectCommand="SELECT DISTINCT Location FROM [T_Employees]"></asp:SqlDataSource>
        </div>
    </ContentTemplate>
</asp:UpdatePanel>
</form>

Answer 1

使用列名

dataGridView.Rows[4].Cells["Name"].Value.ToString();

如果你想遍历每一行，那么

foreach (DataGridViewRow row in dataGrid.Rows)
    {

         foreach (DataGridViewCell cell in row.Cells)
        {
            string value = cell.Value.ToString();

        }
    }

此外，您可以执行以下操作来实现您的目标

string name = (string)dataGridView1.SelectedRows[0].Cells[0].Value;

Answer 2

如果您使用datagrid的SelectionChanged事件。那你可以尝试一下

    private void dataGrid1_SelectionChanged(object sender, SelectionChangedEventArgs e)
            {
                object item = dataGrid1.SelectedItem;
                txtRegId.Text = (dataGrid1.SelectedCells[0].Column.GetCellContent(item) as TextBlock).Text;
                MessageBox.Show(txtName.Text);
            }

Answer 3

您必须使用 回发事件 和参数来获取所选值。

阅读 this 这是关于您的问题的教程

从数据网格视图中读取数据

3 个答案: