C# 在WCF中创建自定义可空类实现_C#_.net_Wcf_Xml Serialization_Iis Express

C# 在WCF中创建自定义可空类实现

c# .net wcf

C# 在WCF中创建自定义可空类实现,c#,.net,wcf,xml-serialization,iis-express,C#,.net,Wcf,Xml Serialization,Iis Express,编程很有趣我创建了自己的可空类实现，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 {

编程很有趣

我创建了自己的可空类实现，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();
    }
}

调用上述函数时，我遇到以下问题：

托管调试助手“FatalExecutionEngineError”检测到 “C:\Program Files（x86）\IIS Express\iisexpress.exe”中存在问题

其他信息：运行时遇到致命错误。这个错误地址位于线程0x2568上的0x5bd1399e。错误代码为0xc0000005。此错误可能是CLR或中的错误用户代码的不安全或不可验证部分。这方面的共同来源错误包括COM互操作或PInvoke的用户封送错误可能会损坏堆栈

感谢您的帮助

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：

[ServiceContract]
[XmlSerializerFormat]
public interface IService1
{
    [OperationContract]
    List<Nullable<DateTime>> NullTest();
}

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))
        };
    }
}

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);
        }
    }
}

[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();
    }
}

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))
        };
    }
}

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();
    }
}

只要只使用

可空

，它就可以使用

[XmlSerializerFormat]

，而不是您的
可空
实现。因此，
DataContractSerializer
正在为您的
Nullable
实现传递消息，但
XmlSerializer
没有
换句话说，您有两种选择：
1）使用
DataContractSerializer
+您的
Nullable
实现
2）使用
XmlSerializer
+
Nullable
iSeries设备：

[ServiceContract] [XmlSerializerFormat] public interface IService1 { [OperationContract] List<Nullable<DateTime>> NullTest(); }

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)) }; } }

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); } } }

[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(); } }

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)) }; } }

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(); } }

只要您使用
[DataContract]
和
[DataMember]
正确地装饰您的
可为空的，它就可以工作 iSeries设备： [ServiceContract] [XmlSerializerFormat] public interface IService1 { [OperationContract] List<Nullable<DateTime>> NullTest(); } 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)) }; } } 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); } } } [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(); } } 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)) }; } } 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(); } } System.Nullabe 是一个struct ，而不是一个类。当您可以将您类型的变量分配给null 时，使用HasValue 没有多大意义。但是cshtml5 支持null 我也尝试过，请注意，我在服务中有[XmlSerializerFormat] 属性。请参阅我的编辑。