本文整理汇总了C#中System.Web.HttpPostedFile.IsImage方法的典型用法代码示例。如果您正苦于以下问题：C# HttpPostedFile.IsImage方法的具体用法？C# HttpPostedFile.IsImage怎么用？C# HttpPostedFile.IsImage使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Web.HttpPostedFile的用法示例。
在下文中一共展示了HttpPostedFile.IsImage方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: ValidateUploadedFile
/// <summary>
/// Valiate the upload file is allowed to be save
/// </summary>
/// <param name="context">The HTTP Context</param>
/// <param name="postedFile">The uploaded file</param>
/// <param name="fileName">The destination file name</param>
/// <param name="fileType">The destination file MIME type</param>
/// <param name="fileSize">The file full size (in multipart upload it can be that the postedFile is not in the same size)</param>
/// <param name="errorMessage">An error message related to the vertification process</param>
/// <returns>Boolean value that indicates if we can save the file</returns>
public virtual bool ValidateUploadedFile(HttpContext context, HttpPostedFile postedFile, string fileName, string fileType, long fileSize, out string errorMessage)
{
errorMessage = string.Empty;
//-------------------------------------------
// Do we exceed the IIS post size?
//-------------------------------------------
if (fileSize > this.GetIISMaxAllowedPostSize() * 1024)
{
errorMessage = GetResourceString(context, "PostMaxSizeExceeded");
return false;
}
//-------------------------------------------
// Is our file matching the allowed files pattern?
//-------------------------------------------
if (!this.AcceptedFilesPattern.IsMatch(fileName))
{
errorMessage = GetResourceString(context, "InvalidFileType");
return false;
}
//-------------------------------------------
// Check file size
//-------------------------------------------
if (this.FileMaxSize > 0
&& fileSize > this.FileMaxSize)
{
errorMessage = GetResourceString(context, "FileMaxSizeExceeded", ((long)this.FileMaxSize).ToFileSize());
return false;
}
if (this.FileMinSize > 0
&& fileSize < this.FileMinSize)
{
errorMessage = GetResourceString(context, "FileMinSizeNotReached", ((long)this.FileMinSize).ToFileSize());
return false;
}
//-------------------------------------------
// We're exceeding the maximum number of files?
//-------------------------------------------
if (this.MaximumNumberOfFiles > -1
&& this.CountAvailableFiles(context) > this.MaximumNumberOfFiles)
{
errorMessage = GetResourceString(context, "MaximumNumberOfFilesExcceded", this.MaximumNumberOfFiles.ToString());
return false;
}
//-------------------------------------------
// We DO got an image, don't we?
//-------------------------------------------
if (!postedFile.IsImage())
{
errorMessage = "NotValidImage";
return false;
}
//-------------------------------------------
// Image dims vertification
//-------------------------------------------
if (this.ImageMinAllowedWidth > -1
|| this.ImageMinAllowedHeight > -1
|| this.ImageMaxAllowedWidth > -1
|| this.ImageMaxAllowedHeight > -1)
{
/* Note: we're not using try-catch block
* because we do know that we can instantiate Bitmap from the input stream
* since we've already done it in IsImage() extension method. */
using (Bitmap image = new Bitmap(postedFile.InputStream))
{
if (this.ImageMinAllowedWidth > image.Width)
{
errorMessage = GetResourceString(context, "ImageMinAllowedWidthNotMet", this.ImageMinAllowedWidth.ToString());
return false;
}
if (this.ImageMinAllowedHeight > image.Height)
{
errorMessage = GetResourceString(context, "ImageMinAllowedHeightNotMet", this.ImageMinAllowedHeight.ToString());
return false;
}
if (this.ImageMaxAllowedWidth < image.Width)
{
errorMessage = GetResourceString(context, "ImageMaxAllowedWidthExceeded", this.ImageMaxAllowedWidth.ToString());
return false;
}
//.........这里部分代码省略.........