在 WCF 中创建自定义 Nullable class 实现
Creating custom Nullable class implementation in WCF
编程很有趣!
我创建了自己的可为空的 class 实现,如下所示:
[DataContract]
public class Nullable<T> where T : struct
{
public Nullable()
{
}
internal T value;
[DataMember]
public bool HasValue { get; set; }
[DataMember]
public T Value
{
get
{
if (!this.HasValue)
throw new Exception("Property have no value");
return this.value;
}
set
{
this.value = value;
this.HasValue = true;
}
}
public Nullable(T value)
{
Value = value;
}
public T GetValueOrDefault()
{
return this.value;
}
public T GetValueOrDefault(T defaultValue)
{
if (!this.HasValue)
return defaultValue;
return this.value;
}
public override bool Equals(object other)
{
if (!this.HasValue)
return other == null;
if (other == null)
return false;
return this.value.Equals(other);
}
public override int GetHashCode()
{
if (!this.HasValue)
return 0;
return this.Value.GetHashCode();
}
public override string ToString()
{
if (!this.HasValue)
return "";
return this.Value.ToString();
}
}
现在在我的 WCF 服务中,当我创建使用我的自定义可空类型的 List
的函数时,
[ServiceContract]
[XmlSerializerFormat]
public interface IService
{
[OperationContract]
List<Nullable<DateTime>> NullTest();
}
public class MyService : IService
{
public List<Nullable<DateTime>> NullTest()
{
return new List<Nullable<DateTime>>()
{
new Nullable<DateTime>(DateTime.Now),
new Nullable<DateTime>(DateTime.Now.AddDays(2))
};
}
}
调用上述函数时出现以下问题:
Managed Debugging Assistant 'FatalExecutionEngineError' has detected a
problem in 'C:\Program Files (x86)\IIS Express\iisexpress.exe'.
Additional information: The runtime has encountered a fatal error. The
address of the error was at 0x5bd1399e, on thread 0x2568. The error
code is 0xc0000005. This error may be a bug in the CLR or in the
unsafe or non-verifiable portions of user code. Common sources of this
bug include user marshaling errors for COM-interop or PInvoke, which
may corrupt the stack.
感谢帮助
我正在使用 BasicHttpBinding
<service name="MyService">
<endpoint
address=""
binding="basicHttpBinding"
name="BasicHttpEndpoint"
bindingConfiguration=""
contract="IMyService">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
</service>
编辑:
只要您简单地使用 Nullable<DateTime>
,它就可以与 [XmlSerializerFormat]
一起使用,而不是 您对 Nullable<T>
的实现。因此,DataContractSerializer
让您的 Nullable<T>
实现通过,但 XmlSerializer
则不然。
换句话说,你有两个选择:
1) 使用 DataContractSerializer
+ 您的 Nullable<T>
实现;
2) 使用XmlSerializer
+ Nullable<DateTime>
.
I服务:
[ServiceContract]
[XmlSerializerFormat]
public interface IService1
{
[OperationContract]
List<Nullable<DateTime>> NullTest();
}
服务:
public class Service1 : IService1
{
public List<Nullable<DateTime>> NullTest()
{
return new List<Nullable<DateTime>>()
{
new Nullable<DateTime>(DateTime.Now),
new Nullable<DateTime>(DateTime.Now.AddDays(2))
};
}
}
客户:
class Program
{
static void Main(string[] args)
{
try
{
Service1Client client = new Service1Client();
ArrayOfDateTime result = client.NullTest();
foreach (DateTime dt in result)
Console.WriteLine(dt);
Console.ReadLine();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
只要你用 [DataContract]
和 [DataMember]
正确装饰你的 Nullable<T>
它就可以工作。
I服务:
[ServiceContract]
public interface IService1
{
[OperationContract]
List<Nullable<DateTime>> NullTest();
}
[DataContract]
public class Nullable<T> where T : struct
{
public Nullable()
{
}
internal T value;
[DataMember]
public bool HasValue { get; set; }
[DataMember]
public T Value
{
get
{
if (!this.HasValue)
throw new Exception("Property have no value");
return this.value;
}
set
{
this.value = value;
this.HasValue = true;
}
}
public Nullable(T value)
{
Value = value;
}
public T GetValueOrDefault()
{
return this.value;
}
public T GetValueOrDefault(T defaultValue)
{
if (!this.HasValue)
return defaultValue;
return this.value;
}
public override bool Equals(object other)
{
if (!this.HasValue)
return other == null;
if (other == null)
return false;
return this.value.Equals(other);
}
public override int GetHashCode()
{
if (!this.HasValue)
return 0;
return this.Value.GetHashCode();
}
public override string ToString()
{
if (!this.HasValue)
return "";
return this.Value.ToString();
}
}
服务:
public class Service1 : IService1
{
public List<Nullable<DateTime>> NullTest()
{
return new List<Nullable<DateTime>>()
{
new Nullable<DateTime>(DateTime.Now),
new Nullable<DateTime>(DateTime.Now.AddDays(2))
};
}
}
客户:
class Program
{
static void Main(string[] args)
{
Service1Client client = new Service1Client();
NullableOfdateTime[] result = client.NullTest();
foreach (NullableOfdateTime ndt in result)
Console.WriteLine(ndt.Value);
Console.ReadLine();
}
}
编程很有趣!
我创建了自己的可为空的 class 实现,如下所示:
[DataContract]
public class Nullable<T> where T : struct
{
public Nullable()
{
}
internal T value;
[DataMember]
public bool HasValue { get; set; }
[DataMember]
public T Value
{
get
{
if (!this.HasValue)
throw new Exception("Property have no value");
return this.value;
}
set
{
this.value = value;
this.HasValue = true;
}
}
public Nullable(T value)
{
Value = value;
}
public T GetValueOrDefault()
{
return this.value;
}
public T GetValueOrDefault(T defaultValue)
{
if (!this.HasValue)
return defaultValue;
return this.value;
}
public override bool Equals(object other)
{
if (!this.HasValue)
return other == null;
if (other == null)
return false;
return this.value.Equals(other);
}
public override int GetHashCode()
{
if (!this.HasValue)
return 0;
return this.Value.GetHashCode();
}
public override string ToString()
{
if (!this.HasValue)
return "";
return this.Value.ToString();
}
}
现在在我的 WCF 服务中,当我创建使用我的自定义可空类型的 List
的函数时,
[ServiceContract]
[XmlSerializerFormat]
public interface IService
{
[OperationContract]
List<Nullable<DateTime>> NullTest();
}
public class MyService : IService
{
public List<Nullable<DateTime>> NullTest()
{
return new List<Nullable<DateTime>>()
{
new Nullable<DateTime>(DateTime.Now),
new Nullable<DateTime>(DateTime.Now.AddDays(2))
};
}
}
调用上述函数时出现以下问题:
Managed Debugging Assistant 'FatalExecutionEngineError' has detected a problem in 'C:\Program Files (x86)\IIS Express\iisexpress.exe'.
Additional information: The runtime has encountered a fatal error. The address of the error was at 0x5bd1399e, on thread 0x2568. The error code is 0xc0000005. This error may be a bug in the CLR or in the unsafe or non-verifiable portions of user code. Common sources of this bug include user marshaling errors for COM-interop or PInvoke, which may corrupt the stack.
感谢帮助
我正在使用 BasicHttpBinding
<service name="MyService">
<endpoint
address=""
binding="basicHttpBinding"
name="BasicHttpEndpoint"
bindingConfiguration=""
contract="IMyService">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
</service>
编辑:
只要您简单地使用 Nullable<DateTime>
,它就可以与 [XmlSerializerFormat]
一起使用,而不是 您对 Nullable<T>
的实现。因此,DataContractSerializer
让您的 Nullable<T>
实现通过,但 XmlSerializer
则不然。
换句话说,你有两个选择:
1) 使用 DataContractSerializer
+ 您的 Nullable<T>
实现;
2) 使用XmlSerializer
+ Nullable<DateTime>
.
I服务:
[ServiceContract]
[XmlSerializerFormat]
public interface IService1
{
[OperationContract]
List<Nullable<DateTime>> NullTest();
}
服务:
public class Service1 : IService1
{
public List<Nullable<DateTime>> NullTest()
{
return new List<Nullable<DateTime>>()
{
new Nullable<DateTime>(DateTime.Now),
new Nullable<DateTime>(DateTime.Now.AddDays(2))
};
}
}
客户:
class Program
{
static void Main(string[] args)
{
try
{
Service1Client client = new Service1Client();
ArrayOfDateTime result = client.NullTest();
foreach (DateTime dt in result)
Console.WriteLine(dt);
Console.ReadLine();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
只要你用 [DataContract]
和 [DataMember]
正确装饰你的 Nullable<T>
它就可以工作。
I服务:
[ServiceContract]
public interface IService1
{
[OperationContract]
List<Nullable<DateTime>> NullTest();
}
[DataContract]
public class Nullable<T> where T : struct
{
public Nullable()
{
}
internal T value;
[DataMember]
public bool HasValue { get; set; }
[DataMember]
public T Value
{
get
{
if (!this.HasValue)
throw new Exception("Property have no value");
return this.value;
}
set
{
this.value = value;
this.HasValue = true;
}
}
public Nullable(T value)
{
Value = value;
}
public T GetValueOrDefault()
{
return this.value;
}
public T GetValueOrDefault(T defaultValue)
{
if (!this.HasValue)
return defaultValue;
return this.value;
}
public override bool Equals(object other)
{
if (!this.HasValue)
return other == null;
if (other == null)
return false;
return this.value.Equals(other);
}
public override int GetHashCode()
{
if (!this.HasValue)
return 0;
return this.Value.GetHashCode();
}
public override string ToString()
{
if (!this.HasValue)
return "";
return this.Value.ToString();
}
}
服务:
public class Service1 : IService1
{
public List<Nullable<DateTime>> NullTest()
{
return new List<Nullable<DateTime>>()
{
new Nullable<DateTime>(DateTime.Now),
new Nullable<DateTime>(DateTime.Now.AddDays(2))
};
}
}
客户:
class Program
{
static void Main(string[] args)
{
Service1Client client = new Service1Client();
NullableOfdateTime[] result = client.NullTest();
foreach (NullableOfdateTime ndt in result)
Console.WriteLine(ndt.Value);
Console.ReadLine();
}
}