.Net 5中的HttpRequestMessage.Content替代方案

public async Task<IActionResult> PostData(HttpRequest request)
{
    using var reader = new StreamReader(request.Body);
    var body = await reader.ReadToEndAsync();
    // 处理body
}

public async Task<IActionResult> HandleRequest(HttpRequest request)
{
    if (request.ContentType.StartsWith("application/json"))
    {
        using var reader = new StreamReader(request.Body);
        var json = await reader.ReadToEndAsync();
        // 处理JSON数据
    }
    else if (request.ContentType.StartsWith("application/x-www-form-urlencoded"))
    {
        var form = await request.ReadFormAsync();
        // 处理表单数据
    }
    // 其他类型...
}

public async Task<IActionResult> PostData(HttpRequest request)
{
    var cachedRequest = new ContentCachingRequestWrapper(request);
    using var reader = new StreamReader(cachedRequest.Body);
    var body = await reader.ReadToEndAsync();
    // 第一次读取
    // ...
    // 再次读取
    cachedRequest.Body.Position = 0;
    using var readerAgain = new StreamReader(cachedRequest.Body);
    var bodyAgain = await readerAgain.ReadToEndAsync();
}