c# - 从数据库中获取位值并显示在 GridView 的 CheckBox 中

Question

我如何从数据库表中获取位值并在 GridView 中的复选框中显示其值(例如，如果值为 TRUE，则它被选中，否则复选框未选中)？另外，如何获取复选框值并将其插入到具有“位”数据类型列的数据库表中？

这是我的 table image

这是我的 GridView image

这是我的 .CS 代码:

public void lbinssert(Object sender,EventArgs e)
{
    sql.InsertParameters["ColumnName"].DefaultValue =
        ((TextBox)GridView1.FooterRow.FindControl("txtColName")).Text;

    sql.InsertParameters["Dtype"].DefaultValue =
        ((DropDownList)GridView1.FooterRow.FindControl("DropDownList2")).Text;

    sql.InsertParameters["id"].DefaultValue =
        ((DropDownList)GridView1.FooterRow.FindControl("DropDownList2")).Text;

    sql.InsertParameters["null"].DefaultValue =
        ((CheckBox)GridView1.FooterRow.FindControl("nulll")).Text;

    sql.InsertParameters["primary"].DefaultValue = 
        ((CheckBox)GridView1.FooterRow.FindControl("primary")).Text;

    sql.Insert();
}

这是我的 .aspx 代码:

        <asp:TemplateField HeaderText="Column_Name" SortExpression="Column_Name">
            <EditItemTemplate>
                <asp:TextBox ID="txtName" runat="server" Text='<%#Bind("Column_Name")%>'></asp:TextBox>
                <asp:RequiredFieldValidator Text="*" ID="colname" ControlToValidate="txtName" runat="server" ErrorMessage="Column Name is Required" ForeColor="Red"></asp:RequiredFieldValidator>
            </EditItemTemplate>
            <ItemTemplate>
               <asp:Label ID="Label1" runat="server" Text='<%# Bind("Column_Name") %>'></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtColName" runat="server"></asp:TextBox>
                <asp:RequiredFieldValidator ValidationGroup="INSERT" Text="*" ID="insertcolname" ControlToValidate="txtColName"runat="server" ErrorMessage="Column Name is Required" ForeColor="Red"></asp:RequiredFieldValidator>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Data_Type" SortExpression="Data_Type">
            <EditItemTemplate>
                <asp:DropDownList ID="DropDownList1" runat="server" SelectedValue='<%# Bind("Data_Type") %>'>
                    <asp:ListItem>Select Datatype</asp:ListItem>
                    <asp:ListItem>int</asp:ListItem>
                    <asp:ListItem>Float</asp:ListItem>
                    <asp:ListItem>Varchar(50)</asp:ListItem>
                    <asp:ListItem>Varchar(100)</asp:ListItem>
                    <asp:ListItem>double</asp:ListItem>
                </asp:DropDownList>
                <asp:RequiredFieldValidator ID="datatype" ControlToValidate="DropDownList1"
                    runat="server" ErrorMessage="Data Type is Required" ForeColor="Red" InitialValue="Select Datatype">
                </asp:RequiredFieldValidator>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="Label2" runat="server" Text='<%# Bind("Data_Type") %>'></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:DropDownList ID="DropDownList2" runat="server">
                    <asp:ListItem>Select Datatype</asp:ListItem>
                    <asp:ListItem>int</asp:ListItem>
                    <asp:ListItem>Float</asp:ListItem>
                    <asp:ListItem>Varchar(50)</asp:ListItem>
                    <asp:ListItem>Varchar(100)</asp:ListItem>
                    <asp:ListItem>double</asp:ListItem>
                </asp:DropDownList>
                <asp:RequiredFieldValidator ValidationGroup="INSERT" Text="*"  ID="datatype" ControlToValidate="DropDownList2"
                    runat="server" ErrorMessage="Data Type is Required" ForeColor="Red" InitialValue="Select Datatype">
                </asp:RequiredFieldValidator>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Allow_Null_" SortExpression="Allow_Null_">
            <EditItemTemplate>
                <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# DataBinder.Eval(Container.DataItem,"Allow_Null_").ToString().Equals("1") %>'/>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# DataBinder.Eval(Container.DataItem,"Allow_Null_").ToString().Equals("1") %>' enabled="false" />
            </ItemTemplate>
            <FooterTemplate>
                <asp:CheckBox ID="nulll" runat="server" />
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Primary_Key_" SortExpression="Primary_Key_">
            <EditItemTemplate>
                <asp:CheckBox ID="CheckBox2" runat="server" Checked='<%# DataBinder.Eval(Container.DataItem,"Primary_Key_").ToString().Equals("1") %>' />
            </EditItemTemplate>
            <ItemTemplate>
                <asp:CheckBox ID="CheckBox2" runat="server" 
                    Checked='<%# DataBinder.Eval(Container.DataItem,"Primary_Key_").ToString().Equals("1") %>' Enabled="false" />
            </ItemTemplate>
            <FooterTemplate>
                <asp:CheckBox ID="primary" runat="server" />
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Date" SortExpression="Date">
            <EditItemTemplate>
                <asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("Date") %>'></asp:TextBox>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="Label3" runat="server" Text='<%# Bind("Date") %>'></asp:Label>
            </ItemTemplate>
            <FooterTemplate>
                <asp:LinkButton ValidationGroup="INSERT" OnClick="lbinssert" ID="lblInsert" runat="server">Insert</asp:LinkButton>
            </FooterTemplate> 
        </asp:TemplateField>
        <asp:CommandField ShowEditButton="True" />
        <asp:CommandField ShowDeleteButton="True" />
    </Columns>
    <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
    <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
    <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
    <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
    <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
    <SortedAscendingCellStyle BackColor="#FFF1D4" />
    <SortedAscendingHeaderStyle BackColor="#B95C30" />
    <SortedDescendingCellStyle BackColor="#F1E5CE" />
    <SortedDescendingHeaderStyle BackColor="#93451F" />
</asp:GridView>

<asp:ValidationSummary ValidationGroup="INSERT" ID="ValidationSummary1" ForeColor="Red"
    runat="server" Height="54px" style="margin-left: 140px" />

<asp:ValidationSummary ID="ValidationSummary2" ForeColor="Red" runat="server" 
    style="margin-left: 161px" />

<asp:SqlDataSource ID="sql" runat="server" 
    ConnectionString="<%$ ConnectionStrings:db_compilerConnectionString %>"
    SelectCommand="SELECT [Column_Name], [Data_Type], [Allow_Null_], [Primary_Key_], [Date] FROM [tbl_field]"
    DeleteCommand="DELETE * FROM [tbl_field] WHERE [Field_id]=@field" InsertCommand="INSERT INTO [tbl_field] ([Column_Name],[Data_Type],[Database_id],[Allow_Null_],[Primary_Key_])Values (@ColumnName,@Dtype,@id,@null,@primary)"
    UpdateCommand="UPDATE [tbl_field] SET [Column_Name]=@ColumnName,[Data_Type]=@Dtype,[Database_id]=@id,[Allow_Null_]=@null,[Primary_Key_]=@primary">
    <DeleteParameters>
        <asp:Parameter Name="field" Type="Int32" />
    </DeleteParameters>
    <InsertParameters>
        <asp:Parameter Name="ColumnName" Type="String" />
        <asp:Parameter Name="Dtype" Type="String" />
        <asp:Parameter Name="id" Type="String" />
        <asp:Parameter Name="null" Type="Boolean" />
        <asp:Parameter Name="primary" Type="Boolean" />
    </InsertParameters>
    <UpdateParameters>
        <asp:Parameter Name="ColumnName" Type="String" />
        <asp:Parameter Name="Dtype" Type="String" />
        <asp:Parameter Name="id" Type="String" />
        <asp:Parameter Name="null" Type="Boolean"/>
        <asp:Parameter Name="primary" Type="Boolean" /> 
    </UpdateParameters>
</asp:SqlDataSource>

值已插入数据库，但“Allow_Null_”和“Primary_Key_”显示为“NULL”。请告诉我如何解决这个问题。

Answer 1

试试这一行-

sql.InsertParameters["null"].DefaultValue =
  ((CheckBox)GridView1.FooterRow.FindControl("nulll")).Checked == true ? "true":"false";

sql.InsertParameters["primary"].DefaultValue = 
   ((CheckBox)GridView1.FooterRow.FindControl("primary")).Checked == true ? "true":"false";

并且根据您的评论 - 在 gridview 输出中保持不变，取消选中两列复选框。

试试下面的代码

<ItemTemplate>
        <asp:CheckBox ID="CheckBox1" runat="server" 
            Checked='<%# Convert.ToBoolean(DataBinder.Eval(Container.DataItem,"Allow_Null_")) %>' enabled="false" />
    </ItemTemplate>

不需要这个代码-

Checked='<%# DataBinder.Eval(Container.DataItem,"Allow_Null_").ToString().Equals("1") %>'