web API 错误处理The 'ObjectContent`1' type failed to serialize

just added this three lines in my WebApiConfig.cs file...



var json = config.Formatters.JsonFormatter;

json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects;

config.Formatters.Remove(config.Formatters.XmlFormatter);



After this codes were added.the Return XML will be transferred to Json format

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