Question

我编写了一个快速的AJAX脚本，该按钮将在按钮按下事件中调用，该脚本又调用asysnc处理程序以从远程API提取数据。我修改了该脚本，以调用另一个异步的处理程序，并且该处理程序运行良好，我不确定为什么它没有在Visual Studio中达到断点。这是AJAX脚本。

$("#RunNewShodanQuery").click(function (d) {
    $.ajax(
        {
            type: "POST",
            async: true,
            url: "/Tools/Test?handler=UpdateResultsAsync",
            beforeSend: function (xhr) {
                xhr.setRequestHeader("XSRF-TOKEN",
                    $('input:hidden[name="__RequestVerificationToken"]').val());
            },
            error: function (jqXHR, exception) {
                var msg = '';
                if (jqXHR.status === 0) {
                    msg = 'Not connect.\n Verify Network.';
                } else if (jqXHR.status == 404) {
                    msg = 'Requested page not found. [404]';
                } else if (jqXHR.status == 500) {
                    msg = 'Internal Server Error [500].';
                } else if (exception === 'parsererror') {
                    msg = 'Requested JSON parse failed.';
                } else if (exception === 'timeout') {
                    msg = 'Time out error.';
                } else if (exception === 'abort') {
                    msg = 'Ajax request aborted.';
                } else {
                    msg = 'Uncaught Error.\n' + jqXHR.responseText;
                }
                console.log(msg);
            },
            complete: function (res) {
                console.log(res);
            }
        });
})

这里是有问题的处理程序。

    public async Task OnPostUpdateResultsAsync()
    {
        ModelState.Clear();
        foreach (Entry e in _context.Entries)
        {
            // TBI
        }

        // Update Date of Last Scan so as not to make needless API calls spamming refreshes
        DateOfLastScan = DateTime.Now;

        // Dispose of the client once we're done
        client.Dispose();
    }

我将断点放置在另一个测试处理程序中，并使用URL修改了上面的AJAX，以指向新的测试处理程序，而VS在该处理程序中的断点处停止。

    public void OnPostTestHandler()
    {
        int seven = 5;
    }

我现在不知道为什么Visual Studio不会在异步处理程序中达到断点。从浏览器中，我看到条目以状态200返回，并且看起来它正在执行处理程序代码，只是没有停止在其中。任何建议都将受到欢迎。

Answer 1

按照惯例，根据方案OnPost[handler]Async，根据处理程序参数的值选择处理程序方法的名称。

这意味着，对于OnPostUpdateResultsAsync，处理程序名称为UpdateResults，而不是UpdateResultsAsync。

对于Razor页面，PageActionInvoker将调用DefaultPageHandlerMethodSelector.SelectHandlers选择处理程序。

        private List<HandlerMethodDescriptor> SelectHandlers(PageContext context)
    {
        var handlers = context.ActionDescriptor.HandlerMethods;
        var candidates = new List<HandlerMethodDescriptor>();

        // Name is optional, may not be provided.
        var handlerName = GetHandlerName(context);

        // The handler selection process considers handlers according to a few criteria. Handlers
        // have a defined HTTP method that they handle, and also optionally a 'name'.
        //
        // We don't really have a scenario for handler methods without a verb (we don't provide a way
        // to create one). If we see one, it will just never match.
        //
        // The verb must match (with some fuzzy matching) and the handler name must match if
        // there is one.
        //
        // The process is like this:
        //
        //  1. Match the possible candidates on HTTP method
        //  1a. **Added in 2.1** if no candidates matched in 1, then do *fuzzy matching*
        //  2. Match the candidates from 1 or 1a on handler name.

        // Step 1: match on HTTP method.
        var httpMethod = context.HttpContext.Request.Method;
        for (var i = 0; i < handlers.Count; i++)
        {
            var handler = handlers[i];
            if (handler.HttpMethod != null &&
                string.Equals(handler.HttpMethod, httpMethod, StringComparison.OrdinalIgnoreCase))
            {
                candidates.Add(handler);
            }
        }

        // Step 1a: do fuzzy HTTP method matching if needed.
        if (candidates.Count == 0 && AllowFuzzyHttpMethodMatching)
        {
            var fuzzyHttpMethod = GetFuzzyMatchHttpMethod(context);
            if (fuzzyHttpMethod != null)
            {
                for (var i = 0; i < handlers.Count; i++)
                {
                    var handler = handlers[i];
                    if (handler.HttpMethod != null &&
                        string.Equals(handler.HttpMethod, fuzzyHttpMethod, StringComparison.OrdinalIgnoreCase))
                    {
                        candidates.Add(handler);
                    }
                }
            }
        }

        // Step 2: remove candidates with non-matching handlers.
        for (var i = candidates.Count - 1; i >= 0; i--)
        {
            var handler = candidates[i];
            if (handler.Name != null &&
                !handler.Name.Equals(handlerName, StringComparison.OrdinalIgnoreCase))
            {
                candidates.RemoveAt(i);
            }
        }

        return candidates;
    }

AJAX调用未达到异步处理程序中的断点

1 个答案: