将XML发布到asp.net核心2.0 web api
将XML发布到asp.net核心2.0 web api
提问于 2017-09-19 22:10:00
我正在尝试将XML发布到asp.net核心2：
$.ajax({
type: "POST",
url: 'api/Test',
data: "<test>hello<test>",
contentType: "application/xml",
success: function (response) { alert(response); },
});我应该如何编写动作，让它接受xml作为参数？
IActionResult Post([FromBody]string xml)xml is nullIActionResult Post([FromBody]XElement xml)xml is nullIActionResult Post(XElement xml)-> InvalidOperationException:未能创建类型为'System.Xml.Linq.XElement‘的实例。绑定模型的复杂类型不能是抽象类型或值类型，并且必须具有无参数的constructor.IActionResult Post(string xml)-> xml is
在Startup.ConfigureServices中：
services.AddMvc()
.AddXmlSerializerFormatters();如何编写控制器，使其接受XML作为参数？我知道我可以从HttpContext.Request中读取它，但我希望它是参数
回答 3
Stack Overflow用户
回答已采纳
发布于 2017-09-20 19:52:54
我最终创建了自定义的InputFormatter，这非常简单，但是如果有更好的替代方案，非常欢迎你写一个答案！
public class XDocumentInputFormatter : InputFormatter, IInputFormatter, IApiRequestFormatMetadataProvider
{
public XDocumentInputFormatter()
{
SupportedMediaTypes.Add("application/xml");
}
protected override bool CanReadType(Type type)
{
if (type.IsAssignableFrom(typeof(XDocument))) return true;
return base.CanReadType(type);
}
public override async Task<InputFormatterResult> ReadRequestBodyAsync(InputFormatterContext context)
{
var xmlDoc = await XDocument.LoadAsync(context.HttpContext.Request.Body, LoadOptions.None, CancellationToken.None);
return InputFormatterResult.Success(xmlDoc);
}
}在startup.cs中注册XDocumentInputFormatter
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc(options => options.InputFormatters.Insert(0, new XDocumentInputFormatter()));
}Stack Overflow用户
发布于 2018-05-31 17:01:13
对于Liero给出的答案，你应该使用一个StreamReader，这样你就可以支持多种编码了。使用UTF-8、UTF-16和ASCI声明头测试了我的解决方案。
更改XDocumentInputFormatter中的方法：
public override async Task<InputFormatterResult> ReadRequestBodyAsync(InputFormatterContext context)
{
var xmlDoc = await XDocument.LoadAsync(context.HttpContext.Request.Body, LoadOptions.None, CancellationToken.None);
return InputFormatterResult.Success(xmlDoc);
}至下图
public override async Task<InputFormatterResult> ReadRequestBodyAsync(InputFormatterContext context) {
// Use StreamReader to convert any encoding to UTF-16 (default C# and sql Server).
using (var streamReader = new StreamReader(context.HttpContext.Request.Body)) {
var xmlDoc = await XDocument.LoadAsync(streamReader, LoadOptions.None, CancellationToken.None);
return InputFormatterResult.Success(xmlDoc);
}
}Stack Overflow用户
发布于 2020-09-16 00:02:12
这些解决方案可以工作，但在.NET核心3中有一个缺点-它们会导致异常(在调用XDocument.LoadAsync内部)：
不允许System.InvalidOperationException:同步操作。调用ReadAsync或将AllowSynchronousIO设置为true。
以下是我用FileBufferingReadStream修改的解决方案(灵感来自Microsoft.AspNetCore.Mvc.Formatters.XmlSerializerInputFormatter)的代码
public override async Task<InputFormatterResult> ReadRequestBodyAsync(InputFormatterContext context)
{
Check.NotNull(context, nameof(context));
var xmlDoc = await LoadXmlFromRequestAsync(context.HttpContext);
return InputFormatterResult.Success(xmlDoc);
}
private static async Task<XDocument> LoadXmlFromRequestAsync(HttpContext httpContext)
{
Check.NotNull(httpContext, nameof(httpContext));
//Code from Microsoft.AspNetCore.Mvc.Formatters.XmlSerializerInputFormatter to use FileBufferingReadStream to avoid synchronous read issue:
//https://github.com/dotnet/aspnetcore/issues/18723 - Synchronous call inside XDocument.LoadAsync causes --> System.InvalidOperationException: Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead.
int memoryThreshold = 30720;
long contentLength = httpContext.Request.ContentLength.GetValueOrDefault();
if (contentLength > 0 && contentLength < memoryThreshold)
{
memoryThreshold = (int)contentLength;
}
var readStream = new FileBufferingReadStream(httpContext.Request.Body, memoryThreshold);
httpContext.Response.RegisterForDispose(readStream);
await readStream.DrainAsync(CancellationToken.None);
readStream.Seek(0, SeekOrigin.Begin);
try
{
using (var streamReader = new StreamReader(readStream))
{
var xmlDoc = await XDocument.LoadAsync(streamReader, LoadOptions.None, CancellationToken.None);
return xmlDoc;
}
}
finally
{
await readStream.DisposeAsync();
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/46302703
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