WebAPI HelpPage出现Failed to generate the sample for media type 'application/x-www-form-urlencoded'. 错

WebApi参数页面的示例里，出现如下错误：

Failed to generate the sample for media type 'application/x-www-form-urlencoded'. Cannot use formatter 'JQueryMvcFormUrlEncodedFormatter' to write type 'Vehicle'.

调试查了一下原因，是因为WebAPI的Formatter里，存在一个类型为System.Web.Http.ModelBinding.JQueryMvcFormUrlEncodedFormatter的Formatter，而HelpPage又没有对进行对应的解析导致的。本来想改HelpPage代码，但想想其实不需要，只要把这个Formattter在WebAPI里移除就可以了，如下：

在App_Start的WebApiConfig.cs的Register方法里，加下如下这句将其移除：

config.Formatters.Remove(config.Formatters.FirstOrDefault(p => p.GetType() == typeof(System.Web.Http.ModelBinding.JQueryMvcFormUrlEncodedFormatter)));

如果你只要JSON格式，其它不要，可以这样写：

config.Formatters.Clear();
config.Formatters.Add(new System.Net.Http.Formatting.JsonMediaTypeFormatter());

这句的意思是先将Formatter全部清除，再添加你想要的Formatter，这里用了Json，如果要XML，则

config.Formatters.Add(new System.Net.Http.Formatting.XmlMediaTypeFormatter());

参考：

https://stackoverflow.com/questions/18249344/exclude-media-type-sample-from-web-api-help-page

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WebAPI HelpPage出现Failed to generate the sample for media type 'application/x-www-form-urlencoded'. 错

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