如何验证上传文件的格式

发布网友 发布时间：2022-04-21 04:28

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热心网友 时间：2022-04-21 05:57

protected void Page_Load(object sender, EventArgs e)
{
if(IsPostBack)
{
Boolean fileOK = false;
String path = Server.MapPath("~/UploadedImages/");
if (FileUpload1.HasFile)
{
String fileExtension =
System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
String[] allowedExtensions =
{".gif", ".png", ".jpeg", ".jpg"};
for (int i = 0; i < allowedExtensions.Length; i++)
{
if (fileExtension == allowedExtensions[i])
{
fileOK = true;
}
}
}

if (fileOK)
{
try
{
FileUpload1.PostedFile.SaveAs(path
+ FileUpload1.FileName);
Label1.Text = "File uploaded!";
}
catch (Exception ex)
{
Label1.Text = "File could not be uploaded.";
}
}
else
{
Label1.Text = "Cannot accept files of this type.";
}
}
}