[英]How to remove remaining unwanted char from a string
我的字符串输出是
String mystring="My Name¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥";
我如何从我的话中接受这个¥¥¥¥¥¥。 我正在使用C#。
我试过这个
mystring.Trim( '¥' );
但它没有用
我正在聊天,这是我的代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
namespace Chat
{
public partial class Form1 : Form
{
Socket sck;
EndPoint epLocal, epRemote;
public Form1()
{
InitializeComponent();
sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
textLocalIp.Text= GetLocalIP();
textFriendsIp.Text = GetLocalIP();
}
private string GetLocalIP()
{
IPHostEntry host;
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
return ip.ToString();
}
}
return "127.0.0.1";
}
private void MessageCallBack(IAsyncResult aResult)
{
try
{
int size = sck.EndReceiveFrom(aResult, ref epRemote);
if (size > 0)
{
byte[] receivedData = new byte[1464];
receivedData = (byte[])aResult.AsyncState;
ASCIIEncoding eEncoding = new ASCIIEncoding();
string receivedMessage = eEncoding.GetString(receivedData);
string c = Caesar(receivedMessage, -1); // String recibido se cambia alreves
//Console.WriteLine(c.Trim( new Char[] { '¥' } )); //Here is where it doesnt work////////////////////
listMessage.Items.Add("Anonymous: "+c.Trim( '¥' ));
}
byte[] buffer = new byte[1500];
sck.BeginReceiveFrom(buffer,
0,
buffer.Length,
SocketFlags.None,
ref epRemote,
new AsyncCallback(MessageCallBack),
buffer);
}
catch (Exception exp)
{
MessageBox.Show(exp.ToString());
}
}
private void button2_Click(object sender, EventArgs e)
{
try
{
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
string b = Caesar(textMessage.Text, 1); // Sending the Chipper
byte[] msg = new byte[1500];
msg = enc.GetBytes(b);
sck.Send(msg);
listMessage.Items.Add("You: "+textMessage.Text);
textMessage.Clear();
}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
private void button1_Click(object sender, EventArgs e)
{
try
{
//epLocal = new IPEndPoint(IPAddress.Parse(textLocalIP.Text, Convert.ToInt32(textLocalPort.Text));
epLocal = new IPEndPoint(IPAddress.Parse(textLocalIp.Text),Convert.ToInt32(textLocalPort.Text));
sck.Bind(epLocal);
epRemote = new IPEndPoint(IPAddress.Parse(textFriendsIp.Text),
Convert.ToInt32(textFriendsPort.Text));
sck.Connect(epRemote);
byte[] buffer = new byte[1500];
sck.BeginReceiveFrom(buffer,
0,
buffer.Length,
SocketFlags.None,
ref epRemote,
new AsyncCallback(MessageCallBack),
buffer);
button1.Text = "Connected!";
button1.Enabled = false;
button2.Enabled = true;
textMessage.Focus();
}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
static string Caesar(string value, int shift)
{
char[] buffer = value.ToCharArray();
for (int i = 0; i < buffer.Length; i++)
{
// Letter.
char letter = buffer[i];
// Add shift to all.
letter = (char)(letter + shift);
// Subtract 26 on overflow.
// Add 26 on underflow.
if (letter > 'z')
{
letter = (char)(letter - 26);
}
else if (letter < 'a')
{
letter = (char)(letter + 26);
}
// Store.
buffer[i] = letter;
}
return new string(buffer);
}
}
}
错误是我标记它的地方,我的输出就像我的名字一样出现了我的名字。¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥ ¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥
如果您希望变量具有新值,则需要确保将结果返回给它:
mystring = mystring.Trim( '¥' );
你可能会尝试
mystring = mystring.Remove(mystring.IndexOf('¥'));
我相信这将删除该角色的第一个实例后的所有内容。 在此查找文档。 https://msdn.microsoft.com/en-us/library/d8d7z2kk%28v=vs.110%29.aspx
我认为它可以只用一个参数。
这是删除尾随字符的另一种方法。
按照微软的说法 :
TrimEnd方法从当前字符串中删除trimChars参数中的所有尾随字符。 当在字符串末尾遇到不在trimChars中的第一个字符时,修剪操作将停止。
mystring = mystring.TrimEnd( '¥' );
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