class student
{
public string no { get; set; }
public string name { get; set; }
public string tel { get; set; }
public string address { get; set; }
public override string ToString()
{
return string.Format("{0} {1} {2} {3}", no, name, tel, address);
}
}
List<student> mylist = new List<student>();
string current = textBox2.Text;
int ci= mylist.IndexOf((student)from a in mylist where a.name==current select a);
发生以下异常:
附:完整代码:using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Collections;namespace myconnect
{
public partial class connect : Form
{
public connect()
{
InitializeComponent();
}
class student
{
public string no { get; set; }
public string name { get; set; }
public string tel { get; set; }
public string address { get; set; }
public override string ToString()
{
return string.Format("{0} {1} {2} {3}", no, name, tel, address);
}
}
List<student> mylist = new List<student>();
private void connect_Load(object sender, EventArgs e)
{
string filename = "myconnect.txt";
FileStream f1 = new FileStream(filename,FileMode.OpenOrCreate);
StreamReader sr = new StreamReader(f1,Encoding.GetEncoding("gb2312"));
string hasread;
string[] spilt;
while ((hasread = sr.ReadLine()) != null)
{
int i = 0;
spilt = hasread.Split(',');
mylist.Add(new student {no=spilt[0],name=spilt[1],tel=spilt[2],address=spilt[3] });
i++;
}
if (mylist.Count==0)
{
return;
}
textBox1.Text = mylist[0].no;
textBox2.Text = mylist[0].name;
textBox3.Text = mylist[0].tel;
textBox4.Text = mylist[0].address;
} private void btnLast_Click(object sender, EventArgs e)
{
string current = textBox2.Text;
int ci= mylist.IndexOf((student)from a in mylist where a.name==current select a);
//if (ci - 1 > 0)
//{
// textBox1.Text = mylist[ci - 1].no;
// textBox2.Text = mylist[ci - 1].name;
// textBox3.Text = mylist[ci - 1].tel;
// textBox4.Text = mylist[ci - 1].address;
//}
//else
//{
// return;
//}
}
}
}
list
{
public string no { get; set; }
public string name { get; set; }
public string tel { get; set; }
public string address { get; set; }
public override string ToString()
{
return string.Format("{0} {1} {2} {3}", no, name, tel, address);
}
}
List<student> mylist = new List<student>();
string current = textBox2.Text;
int ci= mylist.IndexOf((student)from a in mylist where a.name==current select a);
发生以下异常:
附:完整代码:using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Collections;namespace myconnect
{
public partial class connect : Form
{
public connect()
{
InitializeComponent();
}
class student
{
public string no { get; set; }
public string name { get; set; }
public string tel { get; set; }
public string address { get; set; }
public override string ToString()
{
return string.Format("{0} {1} {2} {3}", no, name, tel, address);
}
}
List<student> mylist = new List<student>();
private void connect_Load(object sender, EventArgs e)
{
string filename = "myconnect.txt";
FileStream f1 = new FileStream(filename,FileMode.OpenOrCreate);
StreamReader sr = new StreamReader(f1,Encoding.GetEncoding("gb2312"));
string hasread;
string[] spilt;
while ((hasread = sr.ReadLine()) != null)
{
int i = 0;
spilt = hasread.Split(',');
mylist.Add(new student {no=spilt[0],name=spilt[1],tel=spilt[2],address=spilt[3] });
i++;
}
if (mylist.Count==0)
{
return;
}
textBox1.Text = mylist[0].no;
textBox2.Text = mylist[0].name;
textBox3.Text = mylist[0].tel;
textBox4.Text = mylist[0].address;
} private void btnLast_Click(object sender, EventArgs e)
{
string current = textBox2.Text;
int ci= mylist.IndexOf((student)from a in mylist where a.name==current select a);
//if (ci - 1 > 0)
//{
// textBox1.Text = mylist[ci - 1].no;
// textBox2.Text = mylist[ci - 1].name;
// textBox3.Text = mylist[ci - 1].tel;
// textBox4.Text = mylist[ci - 1].address;
//}
//else
//{
// return;
//}
}
}
}
list
{
string current = textBox2.Text;
int ci= -1;
var res=mylist.Select((x,i)=>new {name=x.name,i}).Where(x=>x.name==current).First();
if(res!=null)
ci=res.i;
}
int ci = mylist.IndexOf(mylist.First(a => a.name == current));