[英]No boxing or type parameter conversion for generic Type parameter with Mono
以下代碼有什么問題? 我看不出下面提到的錯誤的原因。 我正在使用Mono,這可能是Mono中的一個錯誤,它會在VStudio中編譯沒有錯誤嗎?
public static class ClientFactory {
public static T CreateClient<T, I>()
/* error here */
where T : ClientBase<I>, I
where I : class {
return CreateClient<T, I>(null, null);
}
public static T CreateClient<T, I>(string endpointConfigurationName)
/* error here */
where T : ClientBase<I>, I
where I : class {
return CreateClient<T, I>(endpointConfigurationName, null);
}
public static T CreateClient<T, I>(string endpointConfigurationName, string remoteAddress)
/* error here */
where T : ClientBase<I>, I
where I : class {
return CreateClient<T, I>(endpointConfigurationName, remoteAddress, Settings.Default.UserName, Settings.Default.Password);
}
public static T CreateClient<T, I>(string endpointConfigurationName, string remoteAddress, string userName, string password)
/* NO error here, this method compiles fine */
where T : ClientBase<I>, I
where I : class {
T client;
/* get client instance */
/* do stuff with it */
return client;
}
}
我收到了編譯錯誤:
... / ClientFactory.cs(14,14):錯誤CS0314:類型`T'不能用作泛型類型或方法`... .ClientFactory.CreateClient(string,string)'中的類型參數`T'。 從“T”到“System.ServiceModel.ClientBase”沒有裝箱或類型參數轉換(CS0314)
TL; DR它可能是你的版本中的一個錯誤:它在我的Mono版本上完美編譯。
以下代碼完美編譯:
using System;
namespace so_test
{
public class ClientBase<T> {
// whatever
}
public static class Settings {
public static SettingValues Default;
}
public class SettingValues {
public string UserName;
public string Password;
}
public static class ClientFactory {
public static T CreateClient<T, I>()
/* error here */
where T : ClientBase<I>, I
where I : class {
return CreateClient<T, I>(null, null);
}
public static T CreateClient<T, I>(string endpointConfigurationName)
/* error here */
where T : ClientBase<I>, I
where I : class {
return CreateClient<T, I>(endpointConfigurationName, null);
}
public static T CreateClient<T, I>(string endpointConfigurationName, string remoteAddress)
/* error here */
where T : ClientBase<I>, I
where I : class {
return CreateClient<T, I>(endpointConfigurationName, remoteAddress, Settings.Default.UserName, Settings.Default.Password);
}
public static T CreateClient<T, I>(string endpointConfigurationName, string remoteAddress, string userName, string password)
/* NO error here, this method compiles fine */
where T : ClientBase<I>, I
where I : class {
T client = default(T);
/* get client instance */
/* do stuff with it */
return client;
}
}
}
imac:~ sklivvz$ mono -V
Mono JIT compiler version 2.10.6 (tarball Fri Sep 16 00:13:06 EDT 2011)
Copyright (C) 2002-2011 Novell, Inc, Xamarin, Inc and Contributors. www.mono-project.com
TLS: normal
SIGSEGV: normal
Notification: kqueue
Architecture: x86
Disabled: none
Misc: debugger softdebug
LLVM: yes(2.9svn-mono)
GC: Included Boehm (with typed GC)
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