Question

我正在尝试从复选框选择的网格中删除记录。但它并没有删除记录。哪里出错了有人请帮我找出来。

这是我的代码 -

的Default.aspx -

<asp:Button ID="btnAdd" runat="server" Text="Add" onclick="btnAdd_Click" BackColor="#999966" />
    <asp:Button ID="btnDelete" runat="server" Text="Delete" onclick="btnDelete_Click" BackColor="#999966" />
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="Name" 
        DataSourceID="SqlDataSource1" 
            style="padding: 0px; margin: 0px; border: thin solid #FF9933; width: 500px;" 
            CellPadding="0" EmptyDataText="No records found" ForeColor="#333333" 
            GridLines="None">
        <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
        <HeaderStyle BackColor="Moccasin" Width="500px" Font-Bold="True" 
            ForeColor="Black" />
        <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
        <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
        <SortedAscendingCellStyle BackColor="#E9E7E2" />
        <SortedAscendingHeaderStyle BackColor="#506C8C" />
        <SortedDescendingCellStyle BackColor="#FFFDF8" />
        <SortedDescendingHeaderStyle BackColor="#6F8DAE" />

        <Columns>
            <asp:TemplateField>
                <HeaderTemplate>
                    <asp:CheckBox ID="cbSelectAll" runat="server" onclick="javascript:SelectAllCheckboxes1(this);"  />    
                </HeaderTemplate>
                <ItemTemplate>
                    <asp:CheckBox ID="chk" runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
        </Columns>   
    </asp:GridView>
    </div>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:HRMSConnectionString %>" 
        SelectCommand="SELECT [Name] FROM [Languages]">
    </asp:SqlDataSource>

Default.aspx.cs -

string strcon = ConfigurationManager.ConnectionStrings["Dbconnection"].ConnectionString;
SqlCommand command;
protected void Page_Load(object sender, EventArgs e)
{
    tblAdd.Visible = false;
    Label1.Visible = false;
    GridView1.DataBind();
    if (!Page.IsPostBack)
        {
            fillLanguageGrid();
        }
}

public void fillLanguageGrid()
    {

        GridView1.DataSourceID = "SqlDataSource1";
        GridView1.DataBind();
        GridView1.Visible = true;
    }



protected void btnDelete_Click(object sender, EventArgs e)
{
    foreach (GridViewRow gvrow in GridView1.Rows)
    {
        CheckBox chkdelete = (CheckBox)gvrow.FindControl("chk");
        if (chkdelete.Checked)
        {
            string name= Convert.ToString(GridView1.DataKeys[gvrow.RowIndex].Values["Name"].ToString());
            deleteRecordByName(name);
        }
    }
    fillLanguageGrid();
}

public void deleteRecordByName(string Name)
{

    using (SqlConnection sqlConnection = new SqlConnection(strcon))
    using (SqlCommand cmd = new SqlCommand("[dbo].[hrm_Langauges]", sqlConnection))
    {
       //  define this to be a stored procedure
        cmd.CommandType = CommandType.StoredProcedure;
        command.Parameters.Add(new SqlParameter("@status", SqlDbType.VarChar, 50));
        // define the parameter and set its value
        cmd.Parameters.Add(new SqlParameter("@Name", SqlDbType.VarChar)).Value = Name;

         //open connection, execute DELETE query, close connection
        sqlConnection.Open();
        command.Parameters["@status"].Value = "Delete";
        cmd.ExecuteNonQuery();
        sqlConnection.Dispose();
    }

这是我的存储过程

ALTER PROCEDURE [dbo].[hrm_Langauges]
(
    @Name varchar(120),
    @CreatedOn datetime,
    @UpdatedOn datetime=0,
    @CreatedBy bigint=0,
    @UpdatedBy bigint=0,
    @IsDeleted bit=0,
    @status as varchar(50) = ''
)
AS
BEGIN
    BEGIN TRANSACTION
        DECLARE @ID int;
        SELECT @ID = coalesce((select max(ID) + 1 from Languages), 1)
    COMMIT   

    if(@status = 'Display')
    BEGIN
        SELECT * FROM [dbo].[Languages];
    END
    else if(@status = 'Add')
    BEGIN
        IF EXISTS(SELECT Name FROM [dbo].[Languages] WHERE Name = @Name)
    Begin
    Return 0
    End
    Else
        INSERT INTO [dbo].[Languages](Name, CreatedOn,UpdatedOn,CreatedBy,UpdatedBy,IsDeleted) VALUES(@Name,@CreatedOn,@UpdatedOn,@CreatedBy,@UpdatedBy,@IsDeleted)
    END
    else if(@status = 'Update')
    BEGIN
        UPDATE [dbo].[Languages] Set Name=@Name,UpdatedOn=@UpdatedOn WHERE ID=@ID
    END
    else if(@status = 'Delete')
    BEGIN
        DELETE FROM [dbo].[Languages] WHERE NAME=@NAME
    END
END

这是网格的快照 -

enter image description here

Answer 1

在ASP.NET中，当您在服务器端控件上引发事件时，Page_Load事件始终在控件事件中的代码之前执行。

在您的情况下，您的用户选中复选框，然后按“删除”按钮。这会引发Page_Load事件，然后是btnDelete_Click事件。 Page_Load事件重新加载复选框，有效地破坏用户选中的复选框选择，然后调用按钮事件代码。但此时所选复选框未经检查，因此您的代码运行正常，但不会更改任何内容。

更改Page_Load事件添加

记录不是使用复选框从网格中删除

1 个答案: