Return ArrayList from Generic Handler using C# and VB.Net in ASP.Net

sureshMG...

SOLVED CLOSED ACTIVE ANSWERED
User: sureshMGR
Posted: on Dec 19, 2019 11:12 PM
Forum: ASP.Net Web Forms
Answer: 1
Views: 6263
Sample Code: Download

Hi Friends,

i need to return image names as arraylist from ihttp handler

but it throwing error as "cannot implement system.web.ihttphandler because it does not hae the matching return type of void"

i have attached that page code..

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;

namespace Reveal
{
    /// <summary>
    /// Summary description for NewProductFileUploadHandler
    /// </summary>
    public class NewProductFileUploadHandler : IHttpHandler
    {
        public Array ProcessRequest(HttpContext context)
        {
            string invoiceno = context.Request.Form["invoiceno"];
            string claimno = context.Request.Form["claimno"];
            String[] myList=null;
            if (context.Request.Files.Count > 0)
            {
                string DoccomplNo = "", filename = "";
                HttpFileCollection files = context.Request.Files;            
                for (int i = 0; i < files.Count; i++)
                {
                    HttpPostedFile file = files[i];
                    string fname;
                    string fextension="";
                    DateTime now = DateTime.Now;
                    int year = now.Year;
                    int month = now.Month;
                    int time = now.Hour;
                    int minute = now.Minute;
                    int seconds = now.Second;

                    DoccomplNo = files.AllKeys[0].Split('`')[1];
                    if (HttpContext.Current.Request.Browser.Browser.ToUpper() == "IE" || HttpContext.Current.Request.Browser.Browser.ToUpper() == "INTERNETEXPLORER")
                    {
                        string[] testfiles = file.FileName.Split(new char[] { '\\' });
                        fname = testfiles[testfiles.Length - 1];
                        fextension = System.IO.Path.GetExtension(file.FileName);  
                    }
                    else
                    {
                        fname = file.FileName;
                        fextension = System.IO.Path.GetExtension(file.FileName);  
                    }                
                    string path = context.Server.MapPath("~/NewProductUploadFilesTemp/");
                    file.SaveAs(path + claimno + "_"+i+"_"+year+month+time+minute+seconds + i + fextension + "");

                    filename=claimno+ "_"+i+"_"+year+month+time+minute+seconds + i + fextension + "";
                    myList[i] = filename;
                }
            }
            context.Response.ContentType = "text/plain";
            return myList;
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

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dharmend...

0 3

Reply
ANSWER
User: dharmendr
Replied: on Dec 20, 2019 03:53 AM
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Hi sureshMGR,

Check this example. Now please take its reference and correct your code.

HTML

<asp:Button Text="Get Array" OnClick="GetArray" runat="server" /><hr />
<asp:GridView runat="server" ID="gvNames" />

Code

protected void GetArray(object sender, EventArgs e)
{
    string url = "http://localhost:7957/Return_Array_Handler/Handler.ashx";
    string response = (new System.Net.WebClient()).DownloadString(url);
    string[] names = new System.Web.Script.Serialization.JavaScriptSerializer().Deserialize<string[]>(response);
    gvNames.DataSource = names;
    gvNames.DataBind();
}

VB.Net

Protected Sub GetArray(ByVal sender As Object, ByVal e As EventArgs)
    Dim url As String = "http://localhost:7957/Return_Array_Handler/Handler.ashx"
    Dim response As String = (New System.Net.WebClient()).DownloadString(url)
    Dim names As String() = New System.Web.Script.Serialization.JavaScriptSerializer().Deserialize(Of String())(response)
    gvNames.DataSource = names
    gvNames.DataBind()
End Sub

Handler

<%@ WebHandler Language="C#" Class="Handler" %>

using System;
using System.Web;
using System.Web.Script.Serialization;

public class Handler : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        string[] nameArray = { "John Hammond", "Mudassar Khan", "Suzanne Mathews", "Robert Schidner" };
        context.Response.ContentType = "text/plain";
        JavaScriptSerializer js = new JavaScriptSerializer();
        string json = js.Serialize(nameArray);
        context.Response.Write(json);
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

VB.Net

<%@ WebHandler Language="VB" Class="Handler" %>

Imports System
Imports System.Web
Imports System.Web.Script.Serialization

Public Class Handler : Implements IHttpHandler
    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        Dim nameArray As String() = {"John Hammond", "Mudassar Khan", "Suzanne Mathews", "Robert Schidner"}
        context.Response.ContentType = "text/plain"
        Dim js As JavaScriptSerializer = New JavaScriptSerializer()
        Dim json As String = js.Serialize(nameArray)
        context.Response.Write(json)
    End Sub
 
    Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property
End Class

Screenshot

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Return ArrayList from Generic Handler using C# and VB.Net in ASP.Net

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