Question

我在gridview中有一个更新行的代码，但问题是，当我编辑和更新Row时，它给出了错误，因为输入字符串的格式不正确。在下面的代码行： -

cmd.Parameters.Add("@Active", SqlDbType.Int).Value = Convert.ToInt32(Active);

请参阅我的代码供您参考： -

<asp:GridView ID="grdPostData" runat="server" Width="100%" border="1" Style="border: 1px solid #E5E5E5;"
    CellPadding="3" AutoGenerateColumns="False" AllowPaging="true" PageSize="4" CssClass="hoverTable"
    OnPageIndexChanging="grdPostData_PageIndexChanging" OnRowEditing="grdPostData_RowEditing"
    OnRowDataBound="grdPostData_RowDataBound" DataKeyNames="Id" OnRowCommand="grdPostData_RowCommand" OnRowUpdating="grdPostData_RowUpdating">
    <AlternatingRowStyle BackColor="#CCCCCC" />
    <Columns>
        <asp:BoundField DataField="title" HeaderText="Title" ItemStyle-Width="30" ControlStyle-CssClass="k-grid td">
            <ControlStyle CssClass="k-grid td"></ControlStyle>

            <ItemStyle Width="30px"></ItemStyle>
        </asp:BoundField>
        <asp:BoundField DataField="description" HeaderText="Description" ItemStyle-Width="30"
            ControlStyle-CssClass="k-grid td">
            <ControlStyle CssClass="k-grid td"></ControlStyle>

            <ItemStyle Width="30px"></ItemStyle>
        </asp:BoundField>
        <asp:TemplateField HeaderText="Post Category" ItemStyle-Width="50">
            <ItemTemplate>
                <asp:DropDownList ID="ddlPostCategory" AppendDataBoundItems="true" runat="server"
                    AutoPostBack="false">
                    <%-- <asp:ListItem Text="Select" Value="0"></asp:ListItem>--%>
                </asp:DropDownList>
            </ItemTemplate>

            <ItemStyle Width="50px"></ItemStyle>
        </asp:TemplateField>
        <asp:BoundField DataField="active" HeaderText="Active" ItemStyle-Width="30" ControlStyle-CssClass="k-grid td">
            <ControlStyle CssClass="k-grid td"></ControlStyle>

            <ItemStyle Width="30px"></ItemStyle>
        </asp:BoundField>
        <asp:TemplateField HeaderText="Action" HeaderStyle-Width="15%">
            <ItemTemplate>
                <asp:ImageButton ID="btnDelete" AlternateText="Delete" CommandName="eDelete" CommandArgument='<%# Bind("Id") %>' ImageUrl="~/images/delete.png"
                    runat="server" Width="15px" Height="15px" CausesValidation="False"
                    OnClientClick="return confirm('Are you sure you want to delete this record?')" />
            </ItemTemplate>
            <HeaderStyle Width="15%"></HeaderStyle>
        </asp:TemplateField>
        <asp:CommandField ButtonType="Image" ItemStyle-Width="15" EditImageUrl="~/images/edit.png" CausesValidation="false"
            ShowEditButton="True" ControlStyle-Width="15" ControlStyle-Height="15" CancelImageUrl="~/images/close.png"
            UpdateImageUrl="~/images/update.png">
            <ControlStyle Height="20px" Width="20px"></ControlStyle>

            <ItemStyle Width="15px"></ItemStyle>
        </asp:CommandField>
    </Columns>
    <EmptyDataTemplate>
        No Result Found
    </EmptyDataTemplate>
</asp:GridView>

另见CS代码： -

protected void grdPostData_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    bool IsUpdated = false;
    //getting key value, row id
    int Id = Convert.ToInt32(grdPostData.DataKeys[e.RowIndex].Value.ToString());
    //get all the row field detail here by replacing id's in FindControl("")..
    GridViewRow row = grdPostData.Rows[e.RowIndex];
    string PostTitle = ((TextBox)(row.Cells[0].Controls[0])).Text;
    string Postdesc = ((TextBox)(row.Cells[1].Controls[0])).Text;
    //   string ddlPostCategory = ((DropDownList)(row.Cells[2].Controls[0])).SelectedValue;
    string Active = ((TextBox)(row.Cells[3].Controls[0])).Text;

    using (SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultCSRConnection"].ConnectionString))
    {
        SqlCommand cmd = new SqlCommand();


        cmd.CommandText = "UPDATE tbl_Post SET title=@title, description=@description, active=@active WHERE Id=@Id";
        cmd.Parameters.Add("@Id", SqlDbType.Int).Value = Id;
        cmd.Parameters.Add("@title", SqlDbType.NVarChar, 155).Value = PostTitle;
        cmd.Parameters.Add("@description", SqlDbType.NVarChar, 99999999).Value = Postdesc;
        cmd.Parameters.Add("@Active", SqlDbType.Int).Value = Convert.ToInt32(Active);

        cmd.Connection = conn;
        conn.Open();
        IsUpdated = cmd.ExecuteNonQuery() > 0;
        conn.Close();
    }
    if (IsUpdated)
    {
        ScriptManager.RegisterStartupScript(this, this.GetType(), "alert", "alert('page updated sucessfully');window.location ='csrposts.aspx';", true);
        BindGrid();
    }
    else
    {
        //Error while updating details
        grdPostData.EditIndex = -1;
        //bind gridview here..
        //GET GDATA FROM DATABASE AND BIND TO GRID VIEW
    }
}

我知道这不值得一个问题，试过但找不到。请帮忙。

Dropdownlist aspx的代码： -

<div class="controls">
    <asp:DropDownList ID="ddlActiveInactive" CssClass="selectpicker form-control-drp wd"
        runat="server" Style="width: 100%" ValidationGroup="AddNew">
        <asp:ListItem Value="1" Text="Active"></asp:ListItem>
        <asp:ListItem Value="0" Text="InActive"></asp:ListItem>
    </asp:DropDownList>
</div>

Answer 1

这是一个下拉列表，其值为Active和InActive

如果您确实希望获得DropDownList所选值，请使用FindControl：

var ddlActive = (DropDownList)row.FindControl("ddlActiveInactive");
int active = -1; // or whatever
if(ddlActive.SelectedValue != "")
    active = int.Parse(ddlActive.SelectedValue);
// ...
cmd.Parameters.Add("@Active", SqlDbType.Int)
    .Value = active != -1 ? active : System.Data.SqlTypes.SqlInt32.Null;

Answer 2

使用trim()函数删除空格并将其转换为int。

cmd.Parameters.Add("@Active", SqlDbType.Int).Value = Convert.ToInt32(Active.Trim());

“输入字符串格式不正确”错误

2 个答案: