An object of type "customObject" cannot be converted to a type of "customObject"

Question

When calling a custom object, I get the following error: "Object of type 'customObject' cannot be converted to type 'customObject'."

The following is the scenario when I get this error:

• I am calling a method in a dll dynamically.
• Download assembly
• CreateInstance ....

When calling the MethodInfo.Invoke () method that passes int, the string as an argument to my method works fine => No exceptions are thrown.

But if I try to pass one of my own class objects as a parameter, then I get an exception ArgumentExceptionand is not ArgumentOutOfRangeExceptionor ArgumentNullException.

"Object of type 'customObject' cannot be converted to type 'customObject'."

I am doing this in a web application.

The class file containing this method is in another project. Also, the user object is a separate class in the same file.

, static assembly. - . - customObject . , -, - . cusotm, , . static..:(

. , .

public static object CallWebService(string webServiceAsmxUrl, string serviceName, string methodName, object[] args) 
    { 
        System.Net.WebClient client = new System.Net.WebClient(); 
        //-Connect To the web service 
        using (System.IO.Stream stream = client.OpenRead(webServiceAsmxUrl + "?wsdl")) 
        { 
            //--Now read the WSDL file describing a service. 
            ServiceDescription description = ServiceDescription.Read(stream); 
            ///// LOAD THE DOM ///////// 
            //--Initialize a service description importer. 
            ServiceDescriptionImporter importer = new ServiceDescriptionImporter(); 
            importer.ProtocolName = "Soap12"; // Use SOAP 1.2. 
            importer.AddServiceDescription(description, null, null); 
            //--Generate a proxy client. importer.Style = ServiceDescriptionImportStyle.Client; 
            //--Generate properties to represent primitive values. 
            importer.CodeGenerationOptions = System.Xml.Serialization.CodeGenerationOptions.GenerateProperties; 
            //--Initialize a Code-DOM tree into which we will import the service. 
            CodeNamespace nmspace = new CodeNamespace(); 
            CodeCompileUnit unit1 = new CodeCompileUnit(); 
            unit1.Namespaces.Add(nmspace); 
            //--Import the service into the Code-DOM tree. This creates proxy code 
            //--that uses the service. 
            ServiceDescriptionImportWarnings warning = importer.Import(nmspace, unit1); 
            if (warning == 0) //--If zero then we are good to go 
            { 
                //--Generate the proxy code  
                CodeDomProvider provider1 = CodeDomProvider.CreateProvider("CSharp"); 
                //--Compile the assembly proxy with the appropriate references 
                string[] assemblyReferences = new string[5] { "System.dll", "System.Web.Services.dll", "System.Web.dll", "System.Xml.dll", "System.Data.dll" }; 
                CompilerParameters parms = new CompilerParameters(assemblyReferences); 
                CompilerResults results = provider1.CompileAssemblyFromDom(parms, unit1); 
                //-Check For Errors 
                if (results.Errors.Count > 0) 
                { 
                    StringBuilder sb = new StringBuilder(); 
                    foreach (CompilerError oops in results.Errors) 
                    { 
                        sb.AppendLine("========Compiler error============"); 
                        sb.AppendLine(oops.ErrorText); 
                    } 
                    throw new System.ApplicationException("Compile Error Occured calling webservice. " + sb.ToString()); 
                } 
                //--Finally, Invoke the web service method  
                Type foundType = null; 
                Type[] types = results.CompiledAssembly.GetTypes(); 
                foreach (Type type in types) 
                { 
                    if (type.BaseType == typeof(System.Web.Services.Protocols.SoapHttpClientProtocol)) 
                    { 
                        Console.WriteLine(type.ToString()); 
                        foundType = type; 
                    } 
                } 

                object wsvcClass = results.CompiledAssembly.CreateInstance(foundType.ToString()); 
                MethodInfo mi = wsvcClass.GetType().GetMethod(methodName); 
                return mi.Invoke(wsvcClass, args); 
            } 
            else 
            { 
                return null; 
            } 
        } 
    } 

static , .

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Answer 1

, -? -. , SoapHttpClientProtocol Invoke (methodName, params).

, . .

:

public class SoapClient : SoapHttpClientProtocol
{

    public SoapClient()
    {

    }

    public object[] Invoke(string method, object[] args)
    {
        return base.Invoke(method, args);
    }

}

:

SoapClient soapClient = new SoapClient();
soapClient.Url = webServiceAsmxUrl;
soapClient.Invoke(methodName, args);

, , , .

Answer 2

.

, "methodname" webservice, , args [], "CallWebService", [] , , , .

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, .

• CallWebService ( ). , , , dll .
• CallWebService args.

• -, dll.

  wsvcclass= results.CompiledAssembly.CreateInstance(foundType.ToString());

, ,   , 1.2, args.

CLR , , , , , DLL.

, , , .

, , , webservice.

,

MethodInfo m = type.GetMethod(methodName);
ParameterInfo[] pm = m.GetParameters();
object ob;
object[] y = new object[1];
foreach (ParameterInfo paraminfo in pm)
{
    ob = this.webServiceAssembly.CreateInstance(paraminfo.ParameterType.Name);

    //Some Junk Logic to get the set the values to the properties of the custom Object
    foreach (PropertyInfo propera in ob.GetType().GetProperties())
    {
        if (propera.Name == "AppGroupid")
        {
            propera.SetValue(ob, "SQL2005Tools", null);
        }
        if (propera.Name == "Appid")
        {
            propera.SetValue(ob, "%", null);
        }
    }
    y[0] = ob;
}

Answer 3

, DLL, , DLL .

Answer 4

, . , , .

OP: "customObject" "customObject".

: "System.String" "System.Windows.Forms.AccessibleRole".

:

( CRTL + SHIFT + F, ) AccessibleRole.

, AccessibleRole String, ToString().

, .

I hope this helps others.