ASP.NET Core 修改/替换请求正文 [英] ASP.NET Core modify/substitute request body
本文介绍了ASP.NET Core 修改/替换请求正文的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想对 HttpContext.Request.Body
进行替换.
我尝试在中间件中进行:
I've tried to do it inside a middleware:
public async Task Invoke(HttpContext context)
{
if (context.Request.Path.Value.Contains("DataSourceResult"))
{
var originalBody = new StreamReader(context.Request.Body).ReadToEnd();
DataSourceRequest dataSource = null;
try
{
dataSource = JsonConvert.DeserializeObject<DataSourceRequest>(originalBody);
} catch
{
await _next.Invoke(context);
}
if (dataSource != null && dataSource.Take > 2000)
{
dataSource.Take = 2000;
var bytesToWrite = dataSource.AsByteArray();
await context.Request.Body.WriteAsync(bytesToWrite, 0, bytesToWrite.Length);
}
else
{
var bytesToWrite = originalBody.AsByteArray();
await context.Request.Body.WriteAsync(bytesToWrite, 0, bytesToWrite.Length);
}
}
await _next.Invoke(context);
}
第一个问题是body只能读一次,其次流是只读的,不能写入.
The first problem is that the body can be read only once, and secondly, the stream is read-only and can't be written to.
如何修改/替换Request.Body
?我需要更改请求正文的属性值.
How can I modify/substitute Request.Body
? I need to change property value of request body.
推荐答案
获取请求正文,读取其内容,进行任何必要的更改(如果有的话),然后创建一个新流以向下传递管道.一旦访问,请求流必须被替换.
Take the request body, read its content, make whatever changes are necessary if at all, then create a new stream to pass down the pipeline. Once accessed, the request stream has to be replaced.
public async Task Invoke(HttpContext context) {
var request = context.Request;
if (request.Path.Value.Contains("DataSourceResult")) {
//get the request body and put it back for the downstream items to read
var stream = request.Body;// currently holds the original stream
var originalContent = new StreamReader(stream).ReadToEnd();
var notModified = true;
try {
var dataSource = JsonConvert.DeserializeObject<DataSourceRequest>(originalContent);
if (dataSource != null && dataSource.Take > 2000) {
dataSource.Take = 2000;
var json = JsonConvert.SerializeObject(dataSource);
//replace request stream to downstream handlers
var requestContent = new StringContent(json, Encoding.UTF8, "application/json");
stream = await requestContent.ReadAsStreamAsync();//modified stream
notModified = false;
}
} catch {
//No-op or log error
}
if (notModified) {
//put original data back for the downstream to read
var requestData = Encoding.UTF8.GetBytes(originalContent);
stream = new MemoryStream(requestData);
}
request.Body = stream;
}
await _next.Invoke(context);
}
这篇关于ASP.NET Core 修改/替换请求正文的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文