Page_Load定义变量问题

Question

if(!Page.IsPostBack)
{
  ArrayList arrPersonList=new ArrayList();
}

Answer 1

将ArrayList arrPersonList;
改为ArrayList arrPersonList=new ArrayList();

Answer 2

你写在方法的外面就要加上作用范围private ArrayList arrPersonList;

Answer 3

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
using System.Data;
using System.IO;namespace upload
{
/// <summary>
/// write_ 的摘要说明。
/// </summary>
public class write_net : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox txtTo;
protected System.Web.UI.WebControls.TextBox txtCent;
protected System.Web.UI.WebControls.DropDownList listType;
protected System.Web.UI.WebControls.DropDownList listDept;
protected System.Web.UI.WebControls.DropDownList listPerson;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.CheckBoxList CheckBoxList1;
protected System.Web.UI.WebControls.Button Button2;
protected System.Web.UI.WebControls.Button btnAddFile;
protected System.Web.UI.WebControls.Button btnDelFile;
protected System.Web.UI.HtmlControls.HtmlInputFile upFile;
protected System.Web.UI.WebControls.TextBox txtInfo;
protected System.Web.UI.WebControls.CheckBox CheckBox1;
protected System.Web.UI.WebControls.Button btnSend;
protected System.Web.UI.WebControls.Button btnReset; private string fileDirPath;
private string tempfileDirPath;


private System.Collections.ArrayList arrPersonList=new ArrayList();
protected System.Web.UI.WebControls.Button Button4;
protected System.Web.UI.WebControls.Button btnRemoveRec;
private System.Collections.ArrayList arrDeptList=new ArrayList(); private System.Data.OleDb.OleDbCommand comm;
private System.Data.OleDb.OleDbConnection conn;

private System.Data.DataSet DS_User;
//private System.Data.DataSet DS_Dept; private string mailFrom;

private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!Page.IsPostBack)
{
this.OnLoad();
}
} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{    
this.listType.SelectedIndexChanged += new System.EventHandler(this.listType_SelectedIndexChanged);
this.listDept.SelectedIndexChanged += new System.EventHandler(this.listDept_SelectedIndexChanged);
this.listPerson.SelectedIndexChanged += new System.EventHandler(this.listPerson_SelectedIndexChanged);
this.btnAddFile.Click += new System.EventHandler(this.btnAddFile_Click);
this.btnDelFile.Click += new System.EventHandler(this.btnDelFile_Click);
this.btnSend.Click += new System.EventHandler(this.btnSend_Click);
this.btnReset.Click += new System.EventHandler(this.btnReset_Click);
this.btnRemoveRec.Click += new System.EventHandler(this.btnRemoveRec_Click);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion
#region  功能代码 private void OnLoad()
{
string strConn="Provider=Microsoft.Jet.OleDb.4.0;Data Source=";
//strConn=strConn+Server.MapPath("upload")+"\\db\\system.asa";
strConn=strConn+"D:\\shi\\e\\mydocument\\My studio\\Project\\upload\\src\\db\\system.asa;User Id=;Password=;";
this.conn=new System.Data.OleDb.OleDbConnection(strConn); this.DS_User=new System.Data.DataSet();


conn.Open();
System.Data.OleDb.OleDbDataAdapter da_depts=new System.Data.OleDb.OleDbDataAdapter("select  type from bumen",this.conn);
System.Data.OleDb.OleDbDataAdapter da_persons=new System.Data.OleDb.OleDbDataAdapter("select 部门,姓名,用户名 from [user]",this.conn);
da_depts.Fill(this.DS_User,"depts");
da_persons.Fill(this.DS_User,"persons");
conn.Close();
this.fileDirPath="FILE\\";
this.tempfileDirPath="TEMPFILE\\";
this.arrPersonList=new ArrayList();
this.arrDeptList=new ArrayList(); if(Request.Form["op"]!=null)
{
if(this.Request.Form["op"]=="1")//回复
{
}
} if(Request.QueryString["from"]!=null)
{
this.mailFrom=Request.QueryString["from"];
}
else 
{
//Response.Redirect("error3.htm");
} }
//
private string MakeNewName(string str0)
{

System.Random myRandom =new System.Random();
int ii=myRandom.Next(10000);
ii++;

string str1=System.DateTime.Now.ToShortDateString();
str1+=ii.ToString();
string ex="";
ex=str0.Substring(str0.LastIndexOf(".")); return str1+ex;
} private string MakeOldName(string str)
{
string str1="";
if(str.IndexOf("\\")>-1)
{
int start=str.LastIndexOf("\\");
str1=str.Substring(start+1);
}
else
{
str1=str;
} return str1; }
private string Make_SQL_FileNames()
{ string str1=""; if(this.CheckBoxList1.Items.Count>0)
{
for(int i=0;i<this.CheckBoxList1.Items.Count;i++)
{
//System.Web.UI.WebControls.ListItem item=
//mail_AddFilesName+=this.CheckBoxList1.Items[i].Value.ToString();
string newFileName=this.MakeNewName(this.CheckBoxList1.Items[i].Value.ToString());
string newFullName=this.fileDirPath+newFileName;
System.IO.File.Copy(this.CheckBoxList1.Items[i].Value.ToString(),newFullName); str1+=newFileName;
str1+=",";
}
}
else
str1="  ";
return str1; }
//得到原来的名字；去掉路径名；

Answer 4

//上传附件
private void UploadFile()
{
if(this.upFile.PostedFile!=null)
{
try
{
string oldName=this.MakeOldName(this.upFile.PostedFile.FileName);
string newName=this.MakeNewName(oldName);
this.upFile.PostedFile.SaveAs(this.tempfileDirPath+"\\"+newName);
this.CheckBoxList1.Items.Add(new System.Web.UI.WebControls.ListItem(oldName,newName)); }
catch
{ } } } //删除文件
private void DeleteFile()
{
for(int i=0;i<this.CheckBoxList1.Items.Count;i++)
{
System.Web.UI.WebControls.ListItem item =this.CheckBoxList1.Items[i];

if(item.Selected)
{
string fileName=item.Value.ToString();
if(File.Exists(fileName))
{
File.Delete(fileName);
}

this.CheckBoxList1.Items.Remove(item); item=null;
}
} } private bool SendMail()
{

string mail_DateTime="";//System.DateTime.Now.ToShortTimeString();
string mail_from=this.mailFrom;
string mail_cent=this.txtCent.Text.Trim();
string mail_info=this.txtInfo.Text.Trim();
string mail_read="f"; string mail_to=""; string ilevel="";

//得到附件名
string mail_AddFilesName="";

string connMail="Provider=Microsoft.Jet.OleDb.4.0;Data Source=";
connMail=connMail+"D:\\shi\\e\\mydocument\\My studio\\Project\\upload\\src\\db\\mail.mdb";
//connMail=connMail+Server.MapPath("db\\mails.mdb");//+"\\db\\mails";
System.Data.OleDb.OleDbConnection mailConn=new System.Data.OleDb.OleDbConnection(connMail);


//生成sql
string sql1="",sql="";

//sql="INSERT INTO "+MailBox+TempName+"(iDateTime,iaddfile,"+FT+",iinfo,ilevel,cent,iread) VALUES ('"
//sql=sql+iDateTime+"','"+iaddfile+"','"+ifrom+"','"+info+"','"+ilevel+"','"+cent+"','"+iread+"')"

if(this.listType.SelectedIndex==1)
{
ilevel="0";
//sql="insert into Message "
//sql="INSERT INTO message(iDateTime,iaddfile,ifrom,iinfo,ilevel,cent,iread,dept) VALUES ('"
//sql=sql+iDateTime+"','"+iaddfile+"','"+ifrom+"','"+info+"','"+ilevel+"','"+cent+"','"+iread
//sql=sql+"','全体员工')" //先处理文件 mail_AddFilesName=this.Make_SQL_FileNames(); sql="insert into message(iDateTime,iaddfile,ifrom,iinfo,ilevel,cent,iread,dept) VALUES('";
//sql+=System.DateTime.Now.to
sql+=mail_DateTime+",'"+mail_AddFilesName+"','"+mail_from+"','"+ilevel+"','"+mail_cent+"','"+mail_read+",";
sql+="','全体员工')"; this.conn.Open();
this.comm.CommandText=sql;
this.comm.Connection=this.conn;
this.comm.ExecuteNonQuery();
if(this.CheckBox1.Checked)
{
mail_AddFilesName=this.Make_SQL_FileNames(); //sql="INSERT INTO sendout"+Session("id")+"(iDateTime,iaddfile,ito,iinfo,ilevel,cent,iread) VALUES ('"
//sql=sql+iDateTime+"','"+iaddfile+"','全体员工','"+info+"','"+ilevel+"','"+cent+"','"+iread+"')"
sql1="insert info sendout"+mail_from+"(iDateTime,iaddfile,ito,iinfo,ilevel,cent,iread) values ('";
sql1=sql+mail_DateTime+"','"+mail_AddFilesName+"','全体员工','"+mail_info+"','"+ilevel+"','"+mail_cent+"','"+mail_read+"')"; this.comm.CommandText=sql1;
this.comm.Connection=this.conn;
this.comm.ExecuteNonQuery(); }
conn.Close(); }
else if(this.listType.SelectedIndex==2)// 部门文件
{
ilevel="1";//部门不公开 this.conn.Open(); string mail_tos=""; for(int i=0;i<this.arrDeptList.Count;i++)
{
mail_to=this.arrDeptList[i] as string;
mail_tos+=mail_to;
mail_tos+=",";
sql=""; mail_AddFilesName=this.Make_SQL_FileNames(); sql="insert into message(iDateTime,iaddfile,ifrom,iinfo,ilevel,cent,iread,dept) VALUES('";
//sql+=System.DateTime.Now.to
sql+=mail_DateTime+",'"+mail_AddFilesName+"','"+mail_from+"','"+ilevel+"','"+mail_cent+"','"+mail_read+",";
sql+="','"+mail_to+"')";

this.comm.CommandText=sql;
this.comm.Connection=this.conn;
this.comm.ExecuteNonQuery();
} if(this.CheckBox1.Checked)
{
mail_AddFilesName=this.Make_SQL_FileNames(); mail_tos=this.txtTo.Text.Trim(); //sql="INSERT INTO sendout"+Session("id")+"(iDateTime,iaddfile,ito,iinfo,ilevel,cent,iread) VALUES ('"
//sql=sql+iDateTime+"','"+iaddfile+"','全体员工','"+info+"','"+ilevel+"','"+cent+"','"+iread+"')"
sql1="insert info sendout"+mail_from+"(iDateTime,iaddfile,ito,iinfo,ilevel,cent,iread) values ('";
sql1=sql+mail_DateTime+"','"+mail_AddFilesName+"','"+mail_tos+"','"+mail_info+"','"+ilevel+"','"+mail_cent+"','"+mail_read+"')"; this.comm.CommandText=sql1;
this.comm.Connection=this.conn;
this.comm.ExecuteNonQuery(); } conn.Close(); }
else if(this.listType.SelectedIndex==3)
{
ilevel="4";//个人，ilevel无意义
string mail_tos="";
this.conn.Open();
for(int i=0;i<this.arrPersonList.Count;i++)
{
mail_AddFilesName=this.Make_SQL_FileNames();
mail_to=this.arrPersonList[i] as string;
mail_tos+=mail_to;
mail_tos+=",";

sql="insert into recived"+mail_to+"(iDateTime,iaddfile,ifrom,iinfo,ilevel,cent,iread) VALUES ('";
sql=sql+mail_DateTime+"','"+mail_AddFilesName+"','"+this.mailFrom+"','"+mail_info+"','"+ilevel+"','";
sql=sql+mail_cent+"','"+mail_read+"')"; this.comm.CommandText=sql;
this.comm.Connection=this.conn;
this.comm.ExecuteNonQuery(); } if(this.CheckBox1.Checked)
{
mail_tos=this.txtTo.Text.Trim();
mail_AddFilesName=this.Make_SQL_FileNames(); sql="insert into sendout"+this.mailFrom+"(iDateTime,iaddfile,ito,iinfo,ilevel,cent,iread) VALUES ('";
sql=sql+mail_DateTime+"','"+mail_AddFilesName+"','"+mail_tos+"','"+mail_info+"','"+ilevel+"','";
sql=sql+mail_cent+"','"+mail_read+"')"; this.comm.CommandText=sql;
this.comm.Connection=this.conn;
this.comm.ExecuteNonQuery(); } } //comm.Excute sql;
return true;
}

Answer 5

private void OnSelectType()
{
if(this.listType.SelectedItem==null)
return;
/*
if(this.listType.SelectedIndex==0)
{
this.Init_DeptItems();
this.Init_PersonItems(); return;
}*/
this.arrPersonList.Clear();
this.arrDeptList.Clear();
this.CheckBoxList1.Items.Clear();

this.txtTo.Text=""; this.Init_DeptItems();
this.Init_PersonItems(); if(this.listType.SelectedIndex>1)//个人，部门；
{
this.Add_listDetpItem();
}
else if(this.listType.SelectedIndex==1)
{
this.txtTo.Text="公共文件";
} } private void OnSelectDept()
{ if(this.listType.SelectedItem==null)
return;
if(this.listType.SelectedIndex==0)
return; if(this.listDept.SelectedItem==null)
return;
if(this.listDept.SelectedIndex==0)
return;
if(this.listType.SelectedIndex==2)//部门
{
string dept=this.listDept.SelectedItem.Text;
if(this.arrDeptList.IndexOf(dept)<0)
{
this.arrDeptList.Add(dept);
this.txtTo.Text+=(dept+",");
}
}
else if(this.listType.SelectedIndex==3)//个人文件
{
this.Add_listPersonItem();
} }
private void OnSelectPerson()
{
if(this.listType.SelectedIndex!=3)
return;
if(this.listPerson.SelectedItem==null)
return;
if(this.listPerson.SelectedIndex<1)
return;

string personId=this.listPerson.SelectedValue;
string personName=this.listPerson.SelectedItem.Text; if(this.arrPersonList.IndexOf(personId)<0)
{
this.arrPersonList.Add(personId);
this.txtTo.Text+=(personName+",");
}
} private void Init_DeptItems()
{
this.listDept.Items.Clear(); this.listDept.Items.Add(new System.Web.UI.WebControls.ListItem("==选择部门==","-1"));

} private void Init_PersonItems()
{
this.listPerson.Items.Clear();

this.listPerson.Items.Add(new System.Web.UI.WebControls.ListItem("==选择个人==","-1"));

} private void Add_listDetpItem()
{
for(int i=0;i<this.DS_User.Tables["depts"].Rows.Count;i++)
{
this.listDept.Items.Add(new System.Web.UI.WebControls.ListItem(this.DS_User.Tables["depts"].Rows[i][0].ToString(),
this.DS_User.Tables["depts"].Rows[i][0].ToString()));
}
}
private void Add_listPersonItem()
{
if(this.listDept.SelectedItem==null)
return; string dept=this.listDept.SelectedItem.Text.ToString(); for(int i=0;i<this.DS_User.Tables["persons"].Rows.Count;i++)
{
string str=this.DS_User.Tables["persons"].Rows[i][0].ToString();
if(str==dept)
{
this.listPerson.Items.Add(new System.Web.UI.WebControls.ListItem(this.DS_User.Tables["persons"].Rows[i][1].ToString(),
this.DS_User.Tables["persons"].Rows[i][2].ToString()));
}

}
} #endregion private void btnAddFile_Click(object sender, System.EventArgs e)
{
this.UploadFile();
} private void listDept_SelectedIndexChanged(object sender, System.EventArgs e)
{
this.OnSelectDept();

} private void listPerson_SelectedIndexChanged(object sender, System.EventArgs e)
{
this.OnSelectPerson();
} private void btnDelFile_Click(object sender, System.EventArgs e)
{
this.DeleteFile();
} private void listType_SelectedIndexChanged(object sender, System.EventArgs e)
{
this.OnSelectType();

} private void btnRemoveRec_Click(object sender, System.EventArgs e)
{

string str=this.txtTo.Text;
string [] strs=str.Split(','); if(strs.Length>1)
{
this.txtTo.Text="";
for(int i=0;i<strs.Length;i++)
{
this.txtTo.Text+=strs[i];
this.txtTo.Text+=",";
}
}


if(this.listType.SelectedIndex==2)//部门
{
int temp=this.arrDeptList.Count;
if(temp>0)
{
this.arrDeptList.RemoveAt(temp-1); } }
else if(this.listType.SelectedIndex==3)
{
int temp=this.arrPersonList.Count;
if(temp>0)
{
this.arrPersonList.RemoveAt(temp-1);
}
}
} private void btnSend_Click(object sender, System.EventArgs e)
{
this.SendMail();
} private void btnReset_Click(object sender, System.EventArgs e)
{
this.arrPersonList.Clear();
this.arrDeptList.Clear();
this.CheckBoxList1.Items.Clear();
this.listType.SelectedIndex=0;
this.txtTo.Text="";
this.txtCent.Text="";
this.txtInfo.Text="";
}

}
}