假设您通过IIS传递图像文件，请使用ASP.NET页面将图像格式和mime类型更改为可以使用的类型。

Response.ContentType = "image/png";
Response.Clear();
using (Bitmap bmp = new Bitmap(tifFilepath))
  bmp.Save(Response.OutputStream, ImageFormat.Png);
Response.End();

I have been goggling fora solution on how to display a TIFF image in a SSRS report but I couldn t find any and since SSRS doesn s support TIFF, I thought converting the TIFF to one of the suppported format will do the trick. And it did. I don t know if there are similar implementation like this out there, but I am just posting so others could benefit as well. Note this only applies if you have a TIFF image saved on database.

Public Shared Function ToImage(ByVal imageBytes As Byte()) As Byte()
    Dim ms As System.IO.MemoryStream = New System.IO.MemoryStream(imageBytes)
    Dim os As System.IO.MemoryStream = New System.IO.MemoryStream()
    Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(ms)

    img.Save(os, System.Drawing.Imaging.ImageFormat.Jpeg)

    Return os.ToArray()
End Function

Here’s how you can use the code: 1. In the Report Properties, Select Refereneces, click add and browse System.Drawing, Version=2.0.0.0 2. Select the Code Property, Copy paste the function above 3. Click Ok 4. Drop an Image control from the toolbox 4.1. Right-Click the image and select Image Properties 4.2. Set the Image Source to Database 4.3. In the Use this field, Click expression and paste the code below =Code.ToImage(Fields!FormImage.Value)
4.4. Set the appropriate Mime to Jpeg

Regards, Fulbert

谢谢Peter您的代码没有编译，但想法是正确的。

这是我的尝试，对我有效。

protected void Page_Load(object sender, EventArgs e)
{
    Response.ContentType = "image/jpeg";
    Response.Clear();        
    Bitmap bmp = new Bitmap(tifFileLocation);
    bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
    Response.End();

}