asp.net dll 动态生成和调用(转)

  /// <summary>
        /// 动态编译
        /// </summary>
        /// <param name="source"> 要动态编译的代码字符串</param>
        /// <param name="path">生成dll文件的路径</param>
        private void csc(string source, string path)
        {
            CodeDomProvider ccp = CodeDomProvider.CreateProvider("CSharp");
            CompilerParameters options = new CompilerParameters();
            options.GenerateInMemory = true;
            options.GenerateInMemory = false;
            options.TreatWarningsAsErrors = false;
            options.OutputAssembly = path;
            CompilerResults result = ccp.CompileAssemblyFromSource(options, source);
        }

调用dll

为了方便说明一下的方法，先说明一下DLL的代码，大致如下：

using System; 
 
namespace clsTestDll 
 
{ 
 
    /// <summary> 
 
    /// Summary description for TestDll. 
 
    /// </summary> 
 
    public class TestDll 
 
    { 
 
        private string strName; 
 
        public TestDll() 
 
        { 
 
            // 
 
            // TODO: Add constructor logic here 
 
            // 
 
            strName = ""; 
 
        } 
 
 
 
        public string GetValue( int nCount ) 
 
        { 
 
            return string.Format( "Count is ...{0}!", nCount ); 
 
        } 
 
 
 
        public static string GetNewValue( int nCount ) 
 
        { 
 
            return string.Format( "New count is ...{0}!", nCount ); 
 
        } 
 
 
 
        public string Name 
 
        { 
 
            get{ return strName;} 
 
            set{ strName = value;} 
 
        } 
 
    } 
 
}

大致的步骤如下：
 首先加载DLL，具体如下：

    // Load assembly from dll file 
 
    Assembly assembly = Assembly.LoadFrom( "clsTestDll.dll"); 

其次，用加载的assembly来定义指定的类型，例如：

    // Create new type 
 
    Type t = assembly.GetType( "clsTestDll.TestDll");

        然后就可以通过新建的类型来调用类的方法。
       如果是类的静态方法，可以直接调用，如：

// Call static member function by name 
 
    string strReturn = (string) t.InvokeMember("GetNewValue", 
 
        BindingFlags.DeclaredOnly | 
 
        BindingFlags.Public | 
 
        BindingFlags.Static | BindingFlags.InvokeMethod, 
 
        null, 
 
        null, 
 
        new object[]{ 12 } );

如果是类的非静态方法或属性，则需要通过类型，先生成类的对象，如：

 // Create new object of specific class name 
 
    Object obj = t.InvokeMember( 
 
        null, 
 
        BindingFlags.DeclaredOnly | 
 
        BindingFlags.Public | BindingFlags.NonPublic | 
 
        BindingFlags.Instance | BindingFlags.CreateInstance, 
 
        null, 
 
        null, 
 
        null );

接着，就可以通过“obj”对象来进行调用了，如：

// Call member function by name 
 
    strReturn = (string) t.InvokeMember("GetValue", 
 
        BindingFlags.DeclaredOnly | 
 
        BindingFlags.Public | BindingFlags.NonPublic | 
 
        BindingFlags.Instance | BindingFlags.InvokeMethod, 
 
        null, 
 
        obj, 
 
        new object[]{ 12 } ); 
 
 
 
    // Set class property 
 
    t.InvokeMember("Name", 
 
        BindingFlags.DeclaredOnly | 
 
        BindingFlags.Public | BindingFlags.NonPublic | 
 
        BindingFlags.Instance | BindingFlags.SetProperty, 
 
        null, 
 
        obj, 
 
        new Object[] {"Test"} ); 
 
 
 
    // Get class property 
 
    strReturn = (string) t.InvokeMember("Name", 
 
        BindingFlags.DeclaredOnly | 
 
        BindingFlags.Public | BindingFlags.NonPublic | 
 
        BindingFlags.Instance | BindingFlags.GetProperty, 
 
        null, 
 
        obj, 
 
        null);