加载运行时DLL

时间:2014-03-10 01:36:52

标签: c# dll createinstance

我正在尝试加载DLL运行时并在DLL中存在的一个类中调用方法。

这是我加载DLL和调用方法的地方,

Object[] mthdInps = new Object[2]; 
mthdInps[0] = mScope; 
string paramSrvrName = srvrName; 
mthdInps[1] = paramSrvrName; 
Assembly runTimeDLL = Assembly.LoadFrom("ClassLibrary.dll"); 
Type runTimeDLLType = runTimeDLL.GetType("ClassLibrary.Class1"); 
Object compObject = Activator.CreateInstance(runTimeDLLType, mthdInps); 
Type compClass = compObject.GetType(); 
MethodInfo mthdInfo = compClass.GetMethod("Method1"); 
string mthdResult = (string)mthdInfo.Invoke(compObject, null);

这是我试图调用的类(存在于DLL中)及其方法,

namespace ClassLibrary
{
    public class Class1
    {
        public Class1()   {}
        public String Method1(Object[] inpObjs)
        {
        }
    }
}

我得到的错误就是这个, 的 Constructor on type 'ClassLibrary.Class1' not found.

请帮忙。

3 个答案:

答案 0 :(得分:3)

似乎您正在将方法参数传递给类构造函数。

此:

Object compObject = Activator.CreateInstance(runTimeDLLType, mthdInps); 

应该只是:

Object compObject = Activator.CreateInstance(runTimeDLLType); 

然后,使用参数调用方法:

string mthdResult = (string)mthdInfo.Invoke(compObject, new object[] { objs });

答案 1 :(得分:1)

Activator.CreateInstance(Type, Object[])的第二个参数指定构造函数的参数。您需要修改构造函数以获取Object[],或仅使用TypeActivator.CreateInstance(Type)调用它,然后调用传入对象数组的方法。

请参阅msdn文档。

答案 2 :(得分:0)

试试这个:

Object[] mthdInps = new Object[2]; 
mthdInps[0] = mScope; 
string paramSrvrName = srvrName; 
mthdInps[1] = paramSrvrName; 
Assembly runTimeDLL = Assembly.LoadFrom("ClassLibrary.dll"); 
Type runTimeDLLType = runTimeDLL.GetType("ClassLibrary.Class1"); 
//do not pass parameters if the constructor doesn't have 
Object compObject = Activator.CreateInstance(runTimeDLLType); 
Type compClass = compObject.GetType(); 
MethodInfo mthdInfo = compClass.GetMethod("Method1"); 

// one parameter of type object array
object[] parameters = new object[] { mthdInps };
string mthdResult = (string)mthdInfo.Invoke(compObject, parameters );