避免在.NET DataContractSerializer中使用“http://www.w3.org/2001/xmlschema-instance”命名空间

Question

[DataContract(Name = "response", Namespace = "http://domain.com/name")]
public class MyResponseClass
{
    [DataMember(Name = "count", IsRequired = true, Order = 0)]
    public int Count { get; set; }

    [DataMember(Name = "info", IsRequired = false, Order = 1)]
    public InfoClass Info { get; set; }

    [DataMember(Name = "metadata", IsRequired = false, Order = 2)]
    public MetadataList Metadatas { get; set; }

}

<response xmlns="http://domain.com/name">
    <count>4</count>
</response>

<response xmlns="http://domain.com/name" xmlns:i="http://www.w3.org/2001/XmlSchema-instance">
    <count>4</count>
    <info i:nil="true" />
    <metadata i:nil="true" />
</response>

是否有任何方法使DataContractSerializer在节点为空值时不写入节点？

Answer 1

使用emitDefaultValue=false跳过XML中的默认值：

[DataContract(Name = "response", Namespace = "http://domain.com/name")]
public class MyResponseClass 
{
    [DataMember(Name = "count", IsRequired = true, Order = 0, EmitDefaultValue = false)]
    public int Count { get; set; }

    [DataMember(Name = "info", IsRequired = false, Order = 1, EmitDefaultValue = false)]
    public InfoClass Info { get; set; }

    [DataMember(Name = "metadata", IsRequired = false, Order = 2, EmitDefaultValue = false)]
    public MetadataList Metadatas { get; set; }
}

要删除xmlns:i=“http://www.w3.org/2001/xmlschema-instance”，您必须使用例如replace()，如下例所示

public void Write(string filePath, MyResponseClass myResponse)
{
    var serializer = new DataContractSerializer(typeof(MyResponseClass));

    var sb = new StringBuilder();
    using (var writer = new StringWriter(sb))
    using (var xmlWriter = XmlWriter.Create(writer))
    {
        serializer.WriteObject(xmlWriter, myResponse);
    }

    using (StreamWriter stream = new StreamWriter(filePath))
    {
        sb = sb.Replace(" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"", "");
        stream.Write(sb);
    }
}

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