.net - 防止 svcutil 生成 "EmitDefaultValue=false"属性

Question

我最近一直在尝试使用 svcutil 从 xsd 文件生成数据契约，如下所示:

svcutil.exe /t:code /dconly /out:MyContract.cs /n:*,My.Namespace MyDataDefinition.xsd

XSD 主要由如下定义组成:

<xsd:complexType name="SomeComplexObjectType">
    <xsd:sequence>
        <xsd:element name="FirstData" type="xsd:string" minOccurs="0" />
        <xsd:element name="SecondData" type="xsd:string" minOccurs="0" />
    </xsd:sequence>
</xsd:complexType>

svcutil 生成如下内容:

[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.Runtime.Serialization", "3.0.0.0")]
[System.Runtime.Serialization.DataContractAttribute(Name="SomeComplexObjectType")]
public partial class PersonInfo : object, System.Runtime.Serialization.IExtensibleDataObject
{
    private string FirstDataField;
    private string SecondDataField;

    [System.Runtime.Serialization.DataMemberAttribute(EmitDefaultValue=false)]
    public string FirstData
    {
        get
        {
            return this.FirstDataField;
        }
        set
        {
            this.FirstDataField= value;
        }
    }

    [System.Runtime.Serialization.DataMemberAttribute(EmitDefaultValue=false)]
    public string SecondData
    {
        get
        {
            return this.SecondDataField;
        }
        set
        {
            this.SecondDataField= value;
        }
    }
}

这工作正常，但是，“EmitDefaultValue=false”属性不是必需的。更不用说它在 wsdl 中引入了很多噪音，添加了如下内容:

<xsd:element minOccurs="0" name="FirstData" nillable="true" type="xsd:string">
    <xsd:annotation>
        <xsd:appinfo>
            <DefaultValue xmlns="http://schemas.microsoft.com/2003/10/Serialization/" EmitDefaultValue="false"/>
        </xsd:appinfo>
    </xsd:annotation>
</xsd:element>

目前我只是手动编辑生成的合约，但从维护的角度来看这并不理想。

有谁知道如何防止 svcutil 自动生成这些 EmitDefaultValue=false 属性？

Answer 1

请参阅this article 。

On schema import, the EmitDefaultValue property is automatically set to false whenever the WCF-specific annotation mentioned previously is detected. It is also set to false for reference types that have the nillable property set to false to support specific interoperability scenarios that commonly occur when consuming ASP.NET Web services

看来您唯一的选择是修改传入的架构，以便相关元素可以为空。