WCF问题集锦：ReadResponse failed: The server did not return a complete response for this request.

今日。对代码进行单元測试时。发现方法GetAllSupplyTypes报例如以下错误：

[Fiddler] ReadResponse() failed: The server did not return a complete response for this request. Server returned 0 bytes.

/// <summary>
/// SupplyType的值的集合
/// </summary>
[DataContract]
public class SupplyTypeResults : List<SupplyType>
{
    /// <summary>
    /// 构造函数
    /// </summary>
    public SupplyTypeResults()
    {
        this.Add(new SupplyType
        {
            SupplyTypeId = 2,
            SupplyTypeName = "其它投放方式"
        });

        this.Add(new SupplyType
        {
            SupplyTypeId = 1,
            SupplyTypeName = "平台自己主动投放"
        });

        this.Add(new SupplyType
        {
            SupplyTypeId = 0,
            SupplyTypeName = "客户主动领取"
        });
    }
}

当中，SupplyType定义例如以下：

/// <summary>
/// 优惠券发行方式
/// </summary>
[DataContract]
public class SupplyType
{
    /// <summary>
    /// 发行方式Id
    /// </summary>
    [DataMember(Name = "supplyTypeId")]
    public int SupplyTypeId { get; set; }

    /// <summary>
    /// 发行方式名称
    /// </summary>
    [DataMember(Name = "supplyTypeName")]
    public string SupplyTypeName { get; set; }
}

后来不再使用SupplyTypeResults类，在代码中直接使用List<SupplyType>。问题所有解决。

之后。有发现还有一个方法也会产生该问题。可是，该方法不属于此原因范畴。经过一阵排查，发现返回类中有个日期属性没有赋值，导致了该错误的抛出。

经过上述两事件总结能够得出，对于不论什么在序列化过程中可能出错的情况。都会导致server返回0字节数据而报此错误。