c# - TextureBrush 内存不足异常

Question

我正在尝试在另一张图片上放置水印。这是我的代码:

var imgPhoto = Image.FromFile(filePath);
var grPhoto = Graphics.FromImage(imgPhoto);

var point = new Point(imgPhoto.Width - imgWatermark.Width, imgPhoto.Height - imgWatermark.Height);

var brWatermark = new TextureBrush(imgWatermark, new Rectangle(point.X, point.Y, imgWatermark.Width, imgWatermark.Height));

grPhoto.FillRectangle(brWatermark, new Rectangle(point, imgWatermark.Size));
imgPhoto.Save(outputFolder + @"\" + filename);

但是出现了一个问题，TextureBrush 抛出内存不足异常。我四处搜寻，但找不到真正好的解决方案。据我所知，在 TextureBrush 尝试完成其工作之前没有任何处理。

Answer 1

此外，当从中加载 Image 的流已被释放时，也会发生这种情况。如果您计划创建纹理画笔，请尽量避免处理图像流。例如，这会起作用:

var bytes = File.ReadAllBytes("image.bmp");
System.Windows.Controls.Image image = null;
using (var stream = System.IO.MemoryStream(bytes))
{
    image = System.Windows.Controls.Image.FromStream(stream);
    var brush = new System.Drawing.TextureBrush(image); // No issues
}

但是如果错误地处理流，则做几乎相同的事情会产生该异常。

var bytes = File.ReadAllBytes("image.bmp");
System.Windows.Controls.Image image = null;
using (var stream = System.IO.MemoryStream(bytes))
{
     image = System.Windows.Controls.Image.FromStream(stream); 
}
var brush = new System.Drawing.TextureBrush(image); // Exception Thrown!