在 Task.Run 中等待/异步后将 HttpContext.Current 获取为 null

问：

我想在 C# 中使用“即发即弃”方法执行一个方法。每当我用 执行另一个方法时，就会变成 。请让我知道是否有办法在运行方法时保留。Task.RunTask.RunasyncawaitHttpContextnullHttpContextasyncTask.Run

示例代码：

public virtual async Task AddAsync(TModel item)
{
    // Copy HttpContext to use in Task.Run
    var httpRequest = HttpContext.Current?.Request;
    var httpResponse = HttpContext.Current?.Response;
    var contextItems = HttpContext.Current?.Items;

    Task.Run(async () =>
    {
        var taskContext = new HttpContext(httpRequest, httpResponse);

        if (contextItems?.Keys != null)
        {
            foreach (var key in contextItems.Keys)
            {
                taskContext.Items.Add(key, contextItems[key]);
            }
        }

        HttpContext.Current = taskContext; // Context gets copied here correctly.

        try
        {
            await this.InsertAsync(item);
        }
        catch (Exception ex)
        {
            // Log error
        }
    });
}

public virtual async Task InsertAsync(TModel item)
{

    var contextBeforeAwait = HttpContext.Current;  // This is not null
    await this.DoAsyncWork();
    var contextAfterAwait = HttpContext.Current; // Context here becomes null

   // Remaining Insert logic which needs to use HttpContext.Current
}

Web.config 具有：

<httpRuntime targetFramework="4.5" />

<add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />

请让我知道如何避免此问题并在 .HttpContextTask.Run