Question

用户将输入客户编号，然后选择要上传的文件，然后输入说明并按保存按钮。但是，当我检查他们是否选择了一个文件时，它总是返回false！我想知道原因。

编辑：我现在使用带参数enctype =“multipart / form-data”的表单，这包含在更新面板中。表单和更新面板都在母版页中

以下是错误处理并获取HasFile（）值的代码片段：

else if ( ( images.Selected == true || docs.Selected == true ) && 
                  ( Upload.HasFile == false || txtInfo.Text == string.Empty ) )
        {
            if ( Upload.HasFile == false )
                lblErrorMessage.Text = "You haven't selected a file";
            else lblErrorMessage.Text = "You must enter a description";

            validated = false;
        }

这是来自保存按钮的方法

protected void btnSaveNew_Click( object sender, EventArgs e )
    {
        bool validated = true;

        lblErrorMessage.ForeColor = System.Drawing.Color.Red;

        if ( txtCustomerNumber.Text.Length != 8 )
        {
            if ( txtCustomerNumber.Text.Length == 0 )
                lblErrorMessage.Text = "Hey! What about the customer number?";
            else if ( txtCustomerNumber.Text.Length > 8 )
                lblErrorMessage.Text = "Invalid Customer Number length (" + ( txtCustomerNumber.Text.Length - 8 ) + " char(s) too long)";
            else lblErrorMessage.Text = "Invalid Customer Number length (" + ( 8 - txtCustomerNumber.Text.Length ) + " char(s) short)";

            validated = false;
        }

        else if ( links.Selected == true && ( txtLink.Text == string.Empty || txtInfo.Text == string.Empty ) )
        {
            if ( txtLink.Text == string.Empty )
                lblErrorMessage.Text = "Hey! You forgot to enter a link!";
            else lblErrorMessage.Text = "You must enter a description";

            validated = false;
        }

        else if ( ( images.Selected == true || docs.Selected == true ) && 
                  ( Upload.HasFile == false || txtInfo.Text == string.Empty ) )
        {
            if ( Upload.HasFile == false )
                lblErrorMessage.Text = "You haven't selected a file";
            else lblErrorMessage.Text = "You must enter a description";

            validated = false;
        }

        else if ( txtInfoDesc.Text == string.Empty || txtInfo.Text == string.Empty )
        {
            if ( txtInfoDesc.Text == string.Empty )
                lblErrorMessage.Text = "You must enter an info description";
            else lblErrorMessage.Text = "You must enter info Data";

            validated = false;
        }

        if ( validated == false )
        {
            btnModify.Visible           = false;
            btnCreateNew.Visible        = false;
            ddlCustomerNumber.Visible   = false;
            btnSaveNew.Visible          = true;
            btnCancel.Visible           = true;
            txtCustomerNumber.Visible   = true;

            switch ( rblSection.SelectedIndex )
            {
                case 0: txtInfo.Visible = true;
                        txtLink.Visible = true;
                        break;
                case 1: 
                case 2: txtInfo.Visible = true;
                        Upload.Visible  = true;
                        break;
                case 3: txtInfo.Visible     = true;
                        txtInfoDesc.Visible = true;
                        break;
            }

            if ( GetCategoryIDCookie() != 0 )
                divData.Attributes.Add( "Style", "overflow:auto" );
        }
        else
        {
            addNewCustomerNumber( txtCustomerNumber.Text, txtInfoDesc.Text, txtInfo.Text );
            ddlCustomerNumber.Visible = true;
            divData.Attributes.Remove( "Style" );
            Response.Redirect( Request.RawUrl );
        }
    }

Answer 1

文件上传是否包含更新面板？

Answer 2

您的表单标记上是否有enctype =“multipart / form-data”？

Answer 3

你可以发布上传课程的代码吗？也许你错误地将该变量初始化为false，并且在某些事件中忘记将其设置为true。

为什么我的File.HasFile总是返回false

3 个答案: