![总是返回false]( "总是返回false")
本文介绍了为什么我的File.HasFile总是返回false的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
用户将输入一个客户号码，然后选择要上传的文件，然后输入描述并按保存按钮。但是，当我检查他们是否选择了一个文件，它总是返回false！我想知道为什么。编辑：我现在使用参数enctype =multipart / form-data的形式，这是包装在更新面板。
下面是错误处理的代码片段，它取得了HasFile（）的值：
else if（（images.Selected == true || docs.Selected == true）&&
（Upload.HasFile == false || txtInfo.Text == string.Empty））
{
if（Upload.HasFile == false）
lblErrorMessage.Text =您没有选择文件;
else lblErrorMessage.Text =您必须输入描述;
validated = false;
$ b $ p
$ b 这里的方法来自保存按钮$ /
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！客户号码怎么样？
else if（txtCustomerNumber.Text.Length> 8）
lblErrorMessage.Text =无效的客户编号长度（+（txtCustomerNumber.Text.Length - 8）+char（s）too long） ;
else lblErrorMessage.Text =无效的客户编号长度（+（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 =嘿，你忘了输入链接！
else lblErrorMessage.Text =您必须输入描述;
validated = false;
}
else if（（images.Selected == true || docs.Selected == true）&&
（Upload.HasFile == false || txtInfo .Text == string.Empty））
{
if（Upload.HasFile == false）
lblErrorMessage.Text =您没有选择文件。
else lblErrorMessage.Text =您必须输入描述;
validated = false;
else if（txtInfoDesc.Text == string.Empty || txtInfo.Text == string.Empty）
{
if（txtInfoDesc.Text = = string.Empty）
lblErrorMessage.Text =您必须输入信息描述;
else lblErrorMessage.Text =您必须输入信息数据;
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;
案例1：
案例2：txtInfo.Visible = true;
Upload.Visible = true;
break;
案例3：txtInfo.Visible = true;
txtInfoDesc.Visible = true;
break;
$ b $ 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）;
$ div $解析方案
有一个更新面板包裹在文件上传？
The user will enter a customer number, then select a file to upload, then enter a description and press the save button. However, when I check to see if they've selected a file, it always returns false! I'd like to know why.
Edit: I am now using form with parameter enctype="multipart/form-data" and this is wrapped in an update panel. Both the form and update panel are in a master page
Here's the snippet of code that error handles and is getting the HasFile() value:
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;
}
And here's the method that came from, the save button
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 );
}
}
解决方案
Is there an update panel wrapped around the File Upload?
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