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CyberHawke10-Feb-04 1:35
CyberHawke10-Feb-04 1:35 
Hello All,

I have an issue that is driving me crazy, no, not that kind of issue.

I have published an interface that I had intended to use to build objects for both client and server. The problem is, I cannot get my projects to recognize that I have declared an event, even though I can see it right there in the code.

A couple of scenarios:
1. If I don't declare an event, then I can use the published interface without any problems.
2. I can write the interface code directly in my project and again, no problem.

The problem with scenario one is that I need to declare events in my interface in order to be able to use them in both the client and the server.

The problem with scenario two is that now I am not publishing an interface, but rather declaring them in the code for both the client and the server objects. Crazy stuff eh Wink | ;)

This is my published interface which is compiled into a separate assembly:
using System;
using System.Data;

namespace RemoteObjectInterface {
public delegate void TaskCompleted();
public interface IRemoteObject {
event TaskCompleted TaskComplete; // event to be raised or captured

void StartTask();
string GetHostLocation();
DataTable GetProducts();
}
}

In a separate project, I make a reference to this assembly,
and then create a class that implements it:

using System;
using System.Data;
using System.Timers;
using System.Data.SqlClient;
using RemoteObjectInterface; // Reference to compiled assembly

namespace RemoteObject {
public delegate void TaskCompleted(object sender, TaskCompleteEventArgs e);
public class ProductsDB : MarshalByRefObject, IRemoteObject { // declared implementing interface
private static string _connectDef = "Data Source=(local);Initial Catalog=Northwind;Integrated Security=SSPI;";
public event TaskCompleted TaskComplete;
private Timer tmr = new Timer();

public void StartTask() {
tmr.Interval = 10000;
tmr.Elapsed += new ElapsedEventHandler(tmrCallback);
tmr.Start();
}

private void tmrCallback(object sender, ElapsedEventArgs e) {
tmr.Enabled=false;
if (TaskComplete != null) {
TaskComplete(this,new TaskCompleteEventArgs("Task completed on server"));
}
}

// Get the data from the Products table in the Northwind database and return them to the client.
public DataTable GetProducts() {
string SQL = "SELECT * FROM Products";

// Create ADO.NET objects.
SqlConnection cnProducts = new SqlConnection(_connectDef);
SqlCommand cmdProducts = new SqlCommand(SQL,cnProducts);
SqlDataAdapter daProducts = new SqlDataAdapter(cmdProducts);
DataSet dsProducts = new DataSet();

// Execute the command and retrieve the data.
try {
cnProducts.Open();
daProducts.Fill(dsProducts,"Products");
}
catch(Exception ex) {
Console.WriteLine(ex.ToString());
}
finally {
cnProducts.Close();
}
return dsProducts.Tables[0];
}

public override object InitializeLifetimeService() {
return null;
}

// This method allows you to verify that the object is running remotely.
public string GetHostLocation() {
return AppDomain.CurrentDomain.FriendlyName;
}
}

[Serializable]
public class TaskCompleteEventArgs : EventArgs {
private string _result;

public string Result {
get{return _result;}
}

public TaskCompleteEventArgs(string result) {
this._result = result;
}
}
}

If you attempt to compile this code, you receive this error:
'RemoteObject.ProductsDB' does not implement interface member 'RemoteObjectInterface.IRemoteObject.TaskComplete'. 'RemoteObject.ProductsDB.TaskComplete' is either static, not public, or has the wrong return type.

and yet this code with the interface included in the same assembly compiles perfectly fine.

using System;
using System.Data;
using System.Timers;
using System.Data.SqlClient;

namespace RemoteObject {
public delegate void TaskCompleted(object sender, TaskCompleteEventArgs e);
public interface IRemoteObject {
event TaskCompleted TaskComplete;

void StartTask();
string GetHostLocation();
DataTable GetProducts();
}

public class ProductsDB : MarshalByRefObject, IRemoteObject {
private static string _connectDef = "Data Source=(local);Initial Catalog=Northwind;Integrated Security=SSPI;";
public event TaskCompleted TaskComplete;
private Timer tmr = new Timer();

public void StartTask() {
tmr.Interval = 10000;
tmr.Elapsed += new ElapsedEventHandler(tmrCallback);
tmr.Start();
}

private void tmrCallback(object sender, ElapsedEventArgs e) {
tmr.Enabled=false;
if (TaskComplete != null) {
TaskComplete(this,new TaskCompleteEventArgs("Task completed on server"));
}
}

// Get the data from the Products table and return them to the client.
public DataTable GetProducts() {
string SQL = "SELECT * FROM Products";

// Create ADO.NET objects.
SqlConnection cnProducts = new SqlConnection(_connectDef);
SqlCommand cmdProducts = new SqlCommand(SQL,cnProducts);
SqlDataAdapter daProducts = new SqlDataAdapter(cmdProducts);
DataSet dsProducts = new DataSet();

// Execute the command and retrieve the data.
try {
cnProducts.Open();
daProducts.Fill(dsProducts,"Products");
}
catch(Exception ex) {
Console.WriteLine(ex.ToString());
}
finally {
cnProducts.Close();
}
return dsProducts.Tables[0];
}

public override object InitializeLifetimeService() {
return null;
}

// This method allows you to verify that the object is running remotely.
public string GetHostLocation() {
return AppDomain.CurrentDomain.FriendlyName;
}
}

[Serializable]
public class TaskCompleteEventArgs : EventArgs {
private string _result;

public string Result {
get{return _result;}
}

public TaskCompleteEventArgs(string result)
{
this._result = result;
}
}
}

This code compiles fine.
Am I missing something here?

John A Vonesh
Senior Developer
Tran-Tech Inc.

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