在asp.net中调用C＃函数 [英] Calling a C# function in asp.net

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本文介绍了在asp.net中调用C＃函数的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个WebForm before_adm.aspx.cs，其代码如下： 

 。 
。 
。 
 public partial class _Default：System.Web.UI.Page 
 {
 
 protected void Page_Load（object sender，EventArgs e）
 {
 
 
 protected void DropDownList2_SelectedIndexChanged（object sender，EventArgs e）
 {
 DropDown abs = new DropDown（）; 
 abs.DropDown（）; 
 
 .....

我想调用DropDown函数（）在DropDown.cs文件中DropDown.cs中的代码如下： 

  using System; 
使用System.Configuration; 
使用System.Data; 
使用System.Linq; 
使用System.Web; 
使用System.Web.Security; 
使用System.Web.UI; 
使用System.Web.UI.HtmlControls; 
使用System.Web.UI.WebControls; 
使用System.Web.UI.WebControls.WebParts; 
使用System.Xml.Linq; 
使用System.Data.Odbc; 
使用System.Data.SqlClient; 
使用System.Collections; 
使用System.IO; 
使用iTextSharp.text.html.simpleparser; 
使用iTextSharp.text; 
使用iTextSharp.text.pdf; 
使用iTextSharp.text.html; 
 
 ///< summary> 
 /// DropDown的概要描述
 ///< / summary> 
 public class DropDown 
 {
 public DropDown（）
 {
 try 
 {
 
 OdbcConnection myConn = new OdbcConnection（ Driver = {MySQL ODBC 3.51 Driver}; Server = 10.155.160.130; Database = testcase; User = root; Password =; Option = 3;）; 
 OdbcCommand myCmd = new OdbcCommand（select skey，casecode from casetype，myConn）; 
 myConn.Open（）; 
 OdbcDataReader myReader = myCmd.ExecuteReader（）; 
 
 //设置数据绑定。 
 DropDownList3.DataSource = myReader; 
 DropDownList3.DataTextField =skey; 
 DropDownList3.DataValueField =casecode; 
 DropDownList3.DataBind（）; 
 DropDownList3.Items.Insert（0，<  -  Select  - >）; 
 
 
 catch（Exception ex）
 {
 Response.Write（ex.StackTrace）; （DropDownList2.SelectedItem.Text ==Register）
 {
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（STA）
 
 
 $ b if ））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（STM））; 
} 
 else if（DropDownList2.SelectedItem.Text ==Stamp）
 {
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（WP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（FA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（LPA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（SA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CAPL））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（MCA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CRA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（XFER））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（ARP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（TXA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CRIR））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（WPCR））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（AO））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（AUA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CONP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（ELEP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（COAP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（COA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（ARA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CREF））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（ITA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（AAR））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（XFA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（TACR））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（EXAP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（COP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（AUE））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（AUW））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CRMA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CAREV））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CONF））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（PILWP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（SMWP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（XOB））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（SMCP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（AELEP））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（RUIT））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CS））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（RUCA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CRIA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CUSA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（EXA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（SMCRC））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（EA））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CRMAB））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CRMAM））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（COAPM））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CPM））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（MCAM））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（AS））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（PILSM））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（CRREF））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（SMCR））; 
 DropDownList3.Items.Remove（DropDownList3.Items.FindByText（AUSFC））; 
 
 
 else if（DropDownList2.SelectedItem.Text ==<  -  Select  - >）
 {
 DropDownList3.Items.Clear（ ）; 
 
 
 
 
 
 $ b 
 无论我到现在为止做了什么，这是正确的吗？我现在得到的错误是： 
 名称'DropDownList2'在当前上下文中不存在
名称'DropDownList3'在当前上下文中不存在
名称'Response'在当前上下文中不存在
  
 我想创建这个函数，因为我将创建许多这样的WebForms，并且我想调用上的相同函数
 
 
 DropDownList2_SelectedIndexChanged 
我需要传递哪些参数。我想知道传递参数的方式。请指导我。我想在.cs文件中创建许多这样的函数，这将有许多其他用户控件。         p>尝试这种方式
  public class DropDown 
 {
 DropDownList dropDownList3 = null; 
 DropDownList dropDownList2 = null; 
 
 public DropDown（）
 {
} 
 
 public void Register（DropDownList dropDown2，DropDownList dropDown3）
 {
 this .dropDownList2 = dropDown2; 
 this.dropDownList3 = dropDown3; 
 //你的代码在这里
 
 
 code $ $ $ $ $ $ $ $ $ $ $ $ < HttpContext.Current.Response.Write 
 
 
 
使用这个类作为
  DropDown abs = new DropDown（）; 
 abs.Register（dropdown1，dropdown2）; 
  
尽量不要在可能抛出异常的构造函数中编写代码
 
I have a WebForm before_adm.aspx.cs which has the code as follows:
.
.
.
public partial class _Default : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
    {
          DropDown abs =new DropDown();
          abs.DropDown();
    }
.....

I want to call a function DropDown() which is in file DropDown.cs The code in DropDown.cs is as follows:
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.Odbc;
using System.Data.SqlClient;
using System.Collections;
using System.IO;
using iTextSharp.text.html.simpleparser;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html;

/// <summary>
/// Summary description for DropDown
/// </summary>
public class DropDown
{
    public DropDown()
    {
        try
        {

            OdbcConnection myConn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver};Server=10.155.160.130;Database=testcase;User=root;Password=;Option=3;");
            OdbcCommand myCmd = new OdbcCommand("select skey,casecode from casetype", myConn);
            myConn.Open();
            OdbcDataReader myReader = myCmd.ExecuteReader();

            //Set up the data binding.
            DropDownList3.DataSource = myReader;
            DropDownList3.DataTextField = "skey";
            DropDownList3.DataValueField = "casecode";
            DropDownList3.DataBind();
            DropDownList3.Items.Insert(0, "<-- Select -->");

        }
        catch (Exception ex)
        {
            Response.Write(ex.StackTrace);
        }

        if (DropDownList2.SelectedItem.Text == "Register")
        {
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("STA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("STM"));
        }
        else if (DropDownList2.SelectedItem.Text == "Stamp")
        {
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("WP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("FA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("LPA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("SA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CAPL"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("MCA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CRA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("XFER"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("ARP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("TXA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CRIR"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("WPCR"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("AO"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("AUA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CONP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("ELEP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("COAP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("COA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("ARA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CREF"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("ITA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("AAR"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("XFA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("TACR"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("EXAP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("COP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("AUE"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("AUW"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CRMA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CAREV"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CONF"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("PILWP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("SMWP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("XOB"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("SMCP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("AELEP"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("RUIT"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CS"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("RUCA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CRIA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CUSA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("EXA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("SMCRC"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("EA"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CRMAB"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CRMAM"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("COAPM"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CPM"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("MCAM"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("AS"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("PILSM"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("CRREF"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("SMCR"));
            DropDownList3.Items.Remove(DropDownList3.Items.FindByText("AUSFC"));

        }
        else if (DropDownList2.SelectedItem.Text == "<-- Select -->")
        {
            DropDownList3.Items.Clear();
        }
    }

}

Whatever i have done till now,is it correct? I am now getting the error as:
The name 'DropDownList2' does not exist in the current context
The name 'DropDownList3' does not exist in the current context  
The name 'Response' does not exist in the current context

I want to create this function because i will be creating many such WebForms and i want to call the same function on 

  
DropDownList2_SelectedIndexChanged 
  What parameters do i need to pass. i want to know the way to pass the parameters. Please guide me. i want to create many such functions in .cs file which will have many other user controls.




 解决方案 
Try this way 
public class DropDown
{
    DropDownList dropDownList3 = null;
    DropDownList dropDownList2 = null;

    public DropDown()
    {
    }

    public void Register(DropDownList dropDown2, DropDownList dropDown3)
    {
        this.dropDownList2 = dropDown2;
        this.dropDownList3 = dropDown3;
        // your code goes here
     }
}

Use HttpContext.Current.Response.Write



Use this class as 
DropDown abs = new DropDown();
abs.Register(dropdown1, dropdown2);

Try not to write code in constructor which might throw exception


                        
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