C# 如何基于表中的行从gridview中的数据库和行中检索值？

我想根据数据库中的行检索gridview中的值

我试过了，但控件中没有值

我的桌子上有两行

编辑：

<asp:GridView ID="Gridview1" runat="server" AutoGenerateColumns="true">
    <Columns>
        <asp:TemplateField HeaderStyle-BackColor="DarkCyan" HeaderText="Activities">
            <ItemTemplate>
                <asp:DropDownList ID="dropActivities" Width="150px" runat="server"></asp:DropDownList>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Monday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Tuesday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Wednesday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Thursday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Friday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Saturday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox6" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Sunday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox7" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostback)
    {
      bind();
    }
}

private void bind()
{
    int rowIndex = 0;
    DataTable dt = new DataTable();
    DataRow drow = null;
    dt.Columns.Add(new DataColumn("Column0", typeof(string)));
    dt.Columns.Add(new DataColumn("Column1", typeof(string)));
    dt.Columns.Add(new DataColumn("Column2", typeof(string)));
    dt.Columns.Add(new DataColumn("Column3", typeof(string)));
    dt.Columns.Add(new DataColumn("Column4", typeof(string)));
    dt.Columns.Add(new DataColumn("Column5", typeof(string)));
    dt.Columns.Add(new DataColumn("Column6", typeof(string)));
    dt.Columns.Add(new DataColumn("Column7", typeof(string)));

        OleDbCommand cmd = new OleDbCommand("select activities,monday,tuesday,wednesday,thursday,friday,saturday,sunday from activity_values where week = '" + weekNumNow + "' and emp_id = (select emp_id from emp_master where username = '" + username + "')", DbConnection);
        DbConnection.Open();
        OleDbDataReader dr1 = cmd.ExecuteReader();

        while (dr1.Read())
        {
            drow = dt.NewRow();
            //Here I can get the values
            drow["Column0"] = dr1[0].ToString();
            drow["Column1"] = dr1[1].ToString();
            drow["Column2"] = dr1[2].ToString();
            drow["Column3"] = dr1[3].ToString();
            drow["Column4"] = dr1[4].ToString();
            drow["Column5"] = dr1[5].ToString();
            drow["Column6"] = dr1[6].ToString();
            drow["Column7"] = dr1[7].ToString();
            dt.Rows.Add(drow);
            dt.AcceptChanges();

            rowIndex++;
        }
        ViewState["CurrentTable"] = dt;
        Gridview1.DataSource = dt;
        Gridview1.DataBind();
    }

在gridview中添加行，但显示空值

---

有什么想法吗？提前感谢

您需要使用

Eval

在gridview中显示数据，如下所示

<asp:GridView ID="Gridview1" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:TemplateField HeaderStyle-BackColor="DarkCyan" HeaderText="Activities">
            <ItemTemplate>
                <asp:DropDownList ID="dropActivities" Width="150px" runat="server"></asp:DropDownList>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Monday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox1" runat="server" Text='<%# Eval("monday") %>'></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Tuesday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox2" runat="server" Text='<%# Eval("tuesdady") %>'></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Wednesday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox3" runat="server" Text='<%# Eval("wednesday") %>'></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Thursday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox4" runat="server" Text='<%# Eval("thursday") %>'></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Friday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox5" runat="server" Text='<%# Eval("friday") %>'></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Saturday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox6" runat="server" Text='<%# Eval("saturday") %>'></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-BackColor="OliveDrab" HeaderText="Sunday">
            <ItemTemplate>
                <asp:TextBox ID="TextBox7" runat="server" Text='<%# Eval("sunday") %>'></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

dt.Load（）

将自动为

dt

创建所需的列

编辑如果要显示一个空行用于数据输入，请在gridview中使用

，如下所示

private void bind()
{
    int rowIndex = 0;
    DataTable dt = new DataTable();

    OleDbCommand cmd = new OleDbCommand("select activities,monday,tuesday,wednesday,thursday,friday,saturday,sunday from activity_values where week = '" + weekNumNow + "' and emp_id = (select emp_id from emp_master where username = '" + username + "')", DbConnection);
    DbConnection.Open();
    OleDbDataReader dr1 = cmd.ExecuteReader();
    dt.Load(dr1);
    ViewState["CurrentTable"] = dt;
    Gridview1.DataSource = dt;
    Gridview1.DataBind();
}

<asp:GridView ID="Gridview1" runat="server" AutoGenerateColumns="false">
    <Columns>
    .//
    .//keep same
    .//
    </Columns>
    <emptydatatemplate>
        <table>
            <tr>
                <td>
                    <asp:DropDownList ID="dropActivities" Width="150px" runat="server"></asp:DropDownList>
                </td>
                <td>
                     <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> 
                </td>
                .//
                .//And so on
                .//
            </tr>
        </table>
    </emptydatatemplate>
</asp:GridView>

.//
.//保持不变
.//
.//
.等等
.//

您的gridview定义在.aspx中是什么样子的？首先检查您的查询是否返回任何结果，如果是，请检查网格的init，例如，AutogenerateColumns设置为true，我相信通过检查并返回，查询不会返回任何结果。请检查我编辑的……我认为

AutogenerateColumns

应设置为

false

。您是否尝试过使用

dt.Load（dr1）

，而不是自己添加列并手动填充到

dt

？感谢您的回答。我希望此代码可以工作，但如果表中没有任何值，如何实现此目的我希望在gridview中显示一行。。。