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Question

我正在尝试使用AJAX和C＃从文件夹中删除图像。我创建了一个名为Delete.ashx的处理程序以删除图像。我还有一个AJAX函数来获取图像路径并将该路径传递给处理程序

在AJAX中，我有一个变量来获取存储在文本框中的路径（仅此刻）。我试图将路径传递给我的处理程序，但是问题是我试图传递数据路径的处理程序中的变量始终为空。

这是我的代码：

处理程序

public void ProcessRequest(HttpContext context)
{
    string sFileName = context.Request["sFileName"]; //this variable is always empty
    if (File.Exists(context.Server.MapPath("~/images/" + sFileName)))
    {
        File.Delete(context.Server.MapPath("~/images/" + sFileName));
        context.Response.ContentType = "text/plain";
        context.Response.Write("Image deleted Successfully!");
    }
    else
    {
        context.Response.ContentType = "text/plain";
        context.Response.Write("Image Failed to Delete!");
    }
}

AJAX

$(document).ready(function () {
    $("#btnDelete").click(function () {
        removeFile();
        return false;
    });

    function removeFile() {
        var FileName = $("#txtPath").val();
        $.ajax({
            url: 'Delete.ashx',
            type: 'POST',
            data: { 'sFileName': FileName},
            contentType: false,
            processData: false,
            success: function (result) {
                alert(result);
            },
            error: function (xhr, ajaxOptions, thrownError) {
                alert(xhr.status);
                alert(xhr.responseText);
                alert(thrownError);
            }
        });

    }

});

请告知我如何将数据从AJAX传递到处理程序，以使变量不为空。谢谢。

Answer 1

尝试从当前HttpContext获取上下文：

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public void ProcessRequest(HttpContext context)
{
    var context_= System.Web.HttpContext.Current;
    string sFileName = context_.Request["sFileName"];
    if (File.Exists(context_.Server.MapPath("~/images/" + sFileName)))
    {
        File.Delete(context_.Server.MapPath("~/images/" + sFileName));
        context_.Response.ContentType = "text/plain";
        context_.Response.Write("Image deleted Successfully!");
    }
    else
    {
        context_.Response.ContentType = "text/plain";
        context_.Response.Write("Image Failed to Delete!");
    }
}

2

或从ajax发送带有查询字符串的数据

 modify ajax:
 url: 'Delete.ashx?sFileName=blabla',

 server side:
 var sFileName= Request.Form["sFileName"];

Answer 2

在Mennan的帮助下，我已完成以下工作并正在工作：

    public void ProcessRequest(HttpContext context)
    {
        string sFileName = context.Request["sFileName"];
        if (File.Exists(context.Server.MapPath("~/images/" + sFileName)))
        {
            File.Delete(context.Server.MapPath("~/images/" + sFileName));
            context.Response.ContentType = "text/plain";
            context.Response.Write("Image deleted Successfully!");
        }
        else
        {
            context.Response.ContentType = "text/plain";
            context.Response.Write("Image Failed to Delete!");
        }
    }


function removeFile() {
    var FileName = $("#txtPath").val();
    $.ajax({
        url: 'Delete.ashx?sFileName=' + FileName,
        type: 'POST',
        data: { 'sFileName': FileName},
        contentType: false,
        processData: false,
        success: function (result) {
            alert(result);
        },
        error: function (xhr, ajaxOptions, thrownError) {
            alert(xhr.status);
            alert(xhr.responseText);
            alert(thrownError);
        }
    });

}

使用AJAX C＃从文件夹中删除图像

2 个答案:

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