学步园

在WCF/WebService中，如果返回值过大，比如Array,List,DataSet等达到一定数量级的话，可能引发下面的异常：

WebService代码[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
public class Service1 : System.Web.Services.WebService
{

    [WebMethod]
    public List<CommonComplexObject> GetData(int number)
    {
        List<CommonComplexObject> data = new List<CommonComplexObject>();
        for (int i = 0; i < number; i++)
        {
            CommonComplexObject obj = new CommonComplexObject()
            {
                GenerateTime = DateTime.Now,
                ID = System.Guid.NewGuid().ToString(),
                Sign = this.GetType().Namespace
            };
            data.Add(obj);
        }
        return data;
    }
}

[Serializable]
public class CommonComplexObject
{
    public string ID { get; set; }
    public DateTime GenerateTime { get; set; }
    public string Sign { get; set; }
}

Client端代码int number = Convert.ToInt32(this.textBox1.Text);
WebSvc.Service1SoapClient client = new WebSvc.Service1SoapClient();
this.dataGridView1.DataSource = client.GetData(number);

解决方法：修改客户端配置文件app.config 的 maxReceivedMessageSize，maxBufferSize 两个属性。

但是，数量级继续增大，还会遇到新的问题：

2. MaxItemsInObjectGraph Quta Size超过65536（InnerException:System.Runtime.SerializationException)

因为关联配置节点比较多，这个时候就得动用 WCF Service Configuration Edition 来修改了。

(1) 打开app.config 修改 Advanced 节点，为 Endpoint Behaviors 添加一个新的Behavior：“dataContractSerializer”, 修改该属性“MaxItemsInObjectGraph”的值

(2) 修改Client节点的Endpoints的Service1Soap的BehaviorConfiguration关联上刚才增加的NewBehavior

(3) 保存

生成XML如下，其中红色部分是被修改的部分：
<behavior name="NewBehavior"> 
    <dataContractSerializer maxItemsInObjectGraph="65536000" /> 
</behavior> 

...

<endpoint address="http://localhost:3511/Service1.asmx" behaviorConfiguration="NewBehavior" 
                binding="basicHttpBinding" bindingConfiguration="Service1Soap" 
                contract="WebSvc.Service1Soap" name="Service1Soap" />

<?xml version="1.0" encoding="utf-8" ?> 
<configuration> 
    <system.serviceModel> 
        <behaviors> 
            <endpointBehaviors> 
                <behavior name="NewBehavior"> 
                    <dataContractSerializer maxItemsInObjectGraph="65536000" /> 
                </behavior> 
            </endpointBehaviors> 
        </behaviors> 
        <bindings> 
            <basicHttpBinding> 
                <binding name="Service1Soap" closeTimeout="00:01:00" openTimeout="00:01:00" 
                    receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" 
                    bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" 
                    maxBufferSize="65536000" maxBufferPoolSize="524288" maxReceivedMessageSize="65536000" 
                    messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" 
                    useDefaultWebProxy="true"> 
                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" 
                        maxBytesPerRead="4096" maxNameTableCharCount="16384" /> 
                    <security mode="None"> 
                        <transport clientCredentialType="None" proxyCredentialType="None" 
                            realm="" /> 
                        <message clientCredentialType="UserName" algorithmSuite="Default" /> 
                    </security> 
                </binding> 
            </basicHttpBinding> 
        </bindings> 
        <client> 
            <endpoint address="http://localhost:3511/Service1.asmx" behaviorConfiguration="NewBehavior" 
                binding="basicHttpBinding" bindingConfiguration="Service1Soap" 
                contract="WebSvc.Service1Soap" name="Service1Soap" /> 
        </client> 
    </system.serviceModel> 
</configuration>