Asp.net HTTP处理程序问题
对于HTTP处理程序,我是个新手,我正在努力找出我当前代码的问题所在 我似乎犯了这个错误 类“Handler”必须为接口“System.Web.IHttpHandler”实现“subprocessrequest(上下文为HttpContext)” 使用此代码时Asp.net HTTP处理程序问题,asp.net,ihttphandler,Asp.net,Ihttphandler,对于HTTP处理程序,我是个新手,我正在努力找出我当前代码的问题所在 我似乎犯了这个错误 类“Handler”必须为接口“System.Web.IHttpHandler”实现“subprocessrequest(上下文为HttpContext)” 使用此代码时 <%@ WebHandler Language="VB" Class="Handler" %> Imports System Imports System.Web Imports System.Configurati
<%@ WebHandler Language="VB" Class="Handler" %>
Imports System
Imports System.Web
Imports System.Configuration
Imports System.Data.SqlClient
Public Class Handler
Implements IHttpHandler
Public Sub ProcessRequest(ByVal context As HttpContext)
Dim connStr As String = ConfigurationManager.ConnectionStrings("myConnectionString").ConnectionString
Dim con As New SqlConnection(connStr)
' Create SQL Command
Dim cmd As New SqlCommand()
cmd.CommandText = "Select * from My_Images" +
" where id =@id"
cmd.CommandType = System.Data.CommandType.Text
cmd.Connection = con
Dim ImageID As New SqlParameter("@investor", System.Data.SqlDbType.Int)
ImageID.Value = context.Request.QueryString("id")
cmd.Parameters.Add(ImageID)
con.Open()
Dim dReader As SqlDataReader = cmd.ExecuteReader()
dReader.Read()
context.Response.BinaryWrite(DirectCast(dReader("Image"), Byte()))
dReader.Close()
con.Close()
End Sub
Public ReadOnly Property IsReusable As Boolean _
Implements IHttpHandler.IsReusable
Get
Return True
End Get
End Property
End Class
导入系统
导入系统.Web
导入系统配置
导入System.Data.SqlClient
公共类处理程序
实现IHttpHandler
公共子进程请求(ByVal上下文作为HttpContext)
Dim connStr As String=ConfigurationManager.ConnectionString(“myConnectionString”).ConnectionString
Dim con作为新的SqlConnection(connStr)
'创建SQL命令
Dim cmd作为新的SqlCommand()
cmd.CommandText=“从我的图片中选择*”+
“其中id=@id”
cmd.CommandType=System.Data.CommandType.Text
cmd.Connection=con
Dim ImageID作为新的SqlParameter(“@investor”,System.Data.SqlDbType.Int)
ImageID.Value=context.Request.QueryString(“id”)
cmd.Parameters.Add(ImageID)
con.Open()
作为SqlDataReader=cmd.ExecuteReader()的Dim可怕程序
恐惧症
context.Response.BinaryWrite(DirectCast(恐惧(“图像”),Byte())
恐怖分子
con.Close()
端接头
公共只读属性可作为布尔值进行编辑_
实现IHttpHandler.IsReusable
得到
返回真值
结束
端属性
末级
有人有什么想法吗
提前感谢您的方法声明是错误的。 这应该做到:
Public Sub ProcessRequest(context As HttpContext)
MSDN链接:
干杯:)试试:
publicssubprocessrequest(ByVal上下文作为HttpContext)实现IHttpHandler.ProcessRequest
您还需要在IsReusable属性上实现。方法声明
Public Sub ProcessRequest(ByVal context As HttpContext)
应该是
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest