System.Drawing单故障调试

Question

根据this answer关于失败的mono-test-install结果，我在test.cs中放置了以下内容

using System;
using System.Drawing;

class X { 
    static void Main ()
    {
        Bitmap b = new Bitmap (100, 100);
    }
}

然后跑

mcs -pkg:dotnet test.cs

产出：

test.cs(7,16)：警告CS0219:变量‘b’被赋值，但它的值从未被使用过编译成功-1警告

并以以下方式运行生成的exe：

mono test.exe

产出：

Unhandled Exception:
System.TypeInitializationException: An exception was thrown by the type initializer for System.Drawing.GDIPlus ---> System.DllNotFoundException: /usr/local/lib/libgdiplus.so
  at (wrapper managed-to-native) System.Drawing.GDIPlus:GdiplusStartup (ulong&,System.Drawing.GdiplusStartupInput&,System.Drawing.GdiplusStartupOutput&)
  at System.Drawing.GDIPlus..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Drawing.Bitmap..ctor (Int32 width, Int32 height, PixelFormat format) [0x00000] in <filename unknown>:0 
  at System.Drawing.Bitmap..ctor (Int32 width, Int32 height) [0x00000] in <filename unknown>:0 
  at (wrapper remoting-invoke-with-check) System.Drawing.Bitmap:.ctor (int,int)
  at X.Main () [0x00000] in <filename unknown>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: An exception was thrown by the type initializer for System.Drawing.GDIPlus ---> System.DllNotFoundException: /usr/local/lib/libgdiplus.so
  at (wrapper managed-to-native) System.Drawing.GDIPlus:GdiplusStartup (ulong&,System.Drawing.GdiplusStartupInput&,System.Drawing.GdiplusStartupOutput&)
  at System.Drawing.GDIPlus..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Drawing.Bitmap..ctor (Int32 width, Int32 height, PixelFormat format) [0x00000] in <filename unknown>:0 
  at System.Drawing.Bitmap..ctor (Int32 width, Int32 height) [0x00000] in <filename unknown>:0 
  at (wrapper remoting-invoke-with-check) System.Drawing.Bitmap:.ctor (int,int)
  at X.Main () [0x00000] in <filename unknown>:0 

忽略它是安全的，还是下一步我应该调试行NotFoundException: /usr/local/lib/libgdiplus.so？

Answer 1

谢谢乔恩，我刚找到那一页，虽然我没有逐字看，但我在里面放了一个符号链接：

sudo ln -s /usr/lib/libgdiplus.so /usr/local/lib/libgdiplus.so

它解决了错误，现在mono-test-install返回：

您有一个工作的System.Drawing设置

除了语法问题外，还需要解决。