oracle启动内存溢出

 调用GetString方法需要一个实例。 
 
 我已经简化了你的代码并将它变成了一个SSCCE ： 
 
using System;
using System.Reflection.Emit;
using System.Text;

class GetStringDemo {
    public static DynamicMethod GetStringForEncoding(Encoding encoding) {

        var getstringMethod = encoding.GetType().GetMethod("GetString", 
            new Type[] { typeof(byte[]) });    
        var getStringCreator = new DynamicMethod("foo", typeof(string), 
            new Type[] { typeof(byte[]), encoding.GetType() }, typeof(void));
        ILGenerator gen = getStringCreator.GetILGenerator();

        gen.Emit(OpCodes.Ldarg_1);  // this is the instance for callvirt
        gen.Emit(OpCodes.Ldarg_0);        
        gen.Emit(OpCodes.Callvirt, getstringMethod);
        gen.Emit(OpCodes.Box, typeof(string));
        gen.Emit(OpCodes.Ret);

        return getStringCreator;
    }

    public static void Main() {

        var utf8 = Encoding.GetEncoding("utf-8");
        var method = GetStringForEncoding(utf8);
        Console.WriteLine(method.Invoke(null, new object[2] { 
            new byte[] { 0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20,
                         0x32, 0x30, 0x31, 0x34, 0x21 }, 
            utf8 } ));
    }
}
// Output:
Hello 2014!
 
 在调用h.ldarg_0 //Load array之前加载实际的调用目标。 在它缺席的情况下，你确实会得到mscorlib抛出的System.InvalidProgramException 。 

Calling the GetString method requires an instance.
 
I've simplified your code and made it into a SSCCE:
 
using System;
using System.Reflection.Emit;
using System.Text;

class GetStringDemo {
    public static DynamicMethod GetStringForEncoding(Encoding encoding) {

        var getstringMethod = encoding.GetType().GetMethod("GetString", 
            new Type[] { typeof(byte[]) });    
        var getStringCreator = new DynamicMethod("foo", typeof(string), 
            new Type[] { typeof(byte[]), encoding.GetType() }, typeof(void));
        ILGenerator gen = getStringCreator.GetILGenerator();

        gen.Emit(OpCodes.Ldarg_1);  // this is the instance for callvirt
        gen.Emit(OpCodes.Ldarg_0);        
        gen.Emit(OpCodes.Callvirt, getstringMethod);
        gen.Emit(OpCodes.Box, typeof(string));
        gen.Emit(OpCodes.Ret);

        return getStringCreator;
    }

    public static void Main() {

        var utf8 = Encoding.GetEncoding("utf-8");
        var method = GetStringForEncoding(utf8);
        Console.WriteLine(method.Invoke(null, new object[2] { 
            new byte[] { 0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20,
                         0x32, 0x30, 0x31, 0x34, 0x21 }, 
            utf8 } ));
    }
}
// Output:
Hello 2014!
 
Load the actual invocation target before you call h.ldarg_0 //Load array. In its absence you'll indeed get System.InvalidProgramException thrown by mscorlib.