保存图像位图时出现错误 GDI+ 中发生一般错误

Question

下面给出了我的代码，我想要做的是，从项目文件夹中获取图像，然后在图像上添加一些文本，然后将其保存到同一个文件夹中。

string firstText = "Hello";
string secondText = "World";

PointF firstLocation = new PointF(10f, 10f);
PointF secondLocation = new PointF(10f, 50f);
var imageFilePath = Server.MapPath("~/Images/" + "a.png");

Bitmap bitmap = (Bitmap)Image.FromFile(imageFilePath);//load the image file

using (Graphics graphics = Graphics.FromImage(bitmap))
{
    using (Font arialFont = new Font("Arial", 10))
    {
        graphics.DrawString(firstText, arialFont, Brushes.Blue, firstLocation);
        graphics.DrawString(secondText, arialFont, Brushes.Red, secondLocation);
    }
}

bitmap.Save(imageFilePath);//save the image file

Answer 1

我认为您正在尝试覆盖当前打开的图像文件：

Bitmap bitmap = (Bitmap)Image.FromFile(imageFilePath);//load the image file

您可以做一个单独的bitmap 实例，关闭源代码，然后将其保存到同一个文件中。

这是一个你可以参考的代码：

Bitmap bitmap = (Bitmap)Image.FromFile(imageFilePath);
Bitmap temp = new Bitmap(bitmap.Width, bitmap.Height, bitmap.PixelFormat); //Create temporary bitmap
using (Graphics graphics = Graphics.FromImage(temp))
{
    using (Font arialFont = new Font("Arial", 10))
    {
        //Copy source image first
        graphics.DrawImage(bitmap, new Rectangle(0, 0, temp.Width, temp.Height), new Rectangle(0, 0, bitmap.Width, bitmap.Height), GraphicsUnit.Pixel);
        graphics.DrawString(firstText, arialFont, Brushes.Blue, firstLocation);
        graphics.DrawString(secondText, arialFont, Brushes.Red, secondLocation);
    }
}
bitmap.Dispose(); //Dispose your source image
temp.Save(imageFilePath);//save the image file
temp.Dispose(); //Dispose temp after saving