C# 如何从TextBox中删除最后一个字符？
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原文地址: http://stackoverflow.com/questions/12397924/
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How to delete the last character from a TextBox?
提问by Zignd
I'm trying to write a copy of MS Windows Calculator - just to exercise the knowledge I have acquired in the course I'm doing - and I'm having problems to write the Backspacekey, but I have no idea about how to delete the last character on TxtResult.Text(Text Box). So, can some one teach me how to do that?
我正在尝试编写 MS Windows Calculator 的副本 - 只是为了锻炼我在我正在做的课程中获得的知识 - 我在编写Backspace密钥时遇到了问题，但我不知道如何删除TxtResult.Text（文本框）上的最后一个字符。那么，有人可以教我怎么做吗？
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;
namespace ZigndSuperCalc
{
public partial class FrmZigndSC : Form
{
Int64 aux, result;
Int16 cont = 0;
bool sucess;
public FrmZigndSC()
{
InitializeComponent();
}
private void BtnSoma_Click(object sender, EventArgs e)
{
sucess = Int64.TryParse(TxtInput.Text, out aux);
result += aux;
TxtInput.Text = Convert.ToString(result);
TxtInput.Focus();
}
private void BtnCE_Click(object sender, EventArgs e)
{
TxtInput.Text = "0";
}
private void BtnC_Click(object sender, EventArgs e)
{
result = 0;
TxtInput.Text = "0";
}
private void BtnBackspace_Click(object sender, EventArgs e)
{
// write here a method to delete the last character from
}
}
}
采纳答案by rein
If we're mimicking calc.exe, exactly then it's probably something like:
如果我们正在模仿calc.exe，那么它可能是这样的：
string s = TxtResult.Text;
if (s.Length > 1) {
s = s.Substring(0, s.Length - 1);
} else {
s = "0";
}
TxtResult.Text = s;
EDIT: As requested, the Substringmethod I'm using here extracts a portion of the string and assigns it to the Textproperty of the textbox. See: http://msdn.microsoft.com/en-us/library/aka44szs.aspx
编辑：根据要求，Substring我在这里使用的方法提取字符串的一部分并将其分配给Text文本框的属性。请参阅：http: //msdn.microsoft.com/en-us/library/aka44szs.aspx
回答by Lews Therin
Try
尝试
TxtResult.Text = TxtResult.Text.Substring(0, TxtResult.Text.Length - 1);`
回答by Ramzan Ali Qureshi
if (textBox1.TextLength > 0)
{
textBox1.Text = textBox1.Text.Substring(0, (textBox1.TextLength - 1));
}
else
{
MessageBox.Show("No Number.");
}
回答by SAYID DASTAAN
//CLICK ON BUTTON1
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text.Length > 1)
{
textBox1.Text = textBox1.Text.Substring(0, textBox1.Text.Length - 1);
}![enter image description here][1]
else
{
textBox1.Text = "0";
}
}
回答by Nerijus Pocevi?ius
I use this method:
我用这个方法：
private void button_Click(object sender, EventArgs e)
{
if (textbox.Text.Length > 0)
{
textbox.Text = textbox.Text.Remove(textbox.Text.Length - 1);
}
}
回答by RiFat Chowdhury Ron
You have to create a Button named "buttonDel" then
您必须创建一个名为“buttonDel”的按钮，然后
private void buttonDel_Click(object sender, EventArgs e)
{
if (sender == buttonDel)
{
s = textBox1.Text;
if (s.Length > 1)
{
s = s.Substring(0,s.Length - 1);
textBox1.Text = s;
}
else
{
textBox1.Text = "0";
}
}
}
回答by Guillermo Daniel Arias
this worked for me!!
这对我有用！！
private void txtNumCL_TextChanged(object sender, EventArgs e)
{
bool ctrl = Int32.TryParse(txtNumCL.Text, out int outParse);
if (!ctrl && txtNumCL.Text.Length > 0)
{
txtNumCL.Text = txtNumCL.Text.Substring(0, txtNumCL.Text.Length - 1);
txtNumCL.SelectionStart = txtNumCL.Text.Length;
}
}
回答by Max
Updated:
更新：
output.Text=output.Text.Remove(output.Text.Length-1, 1);
Old: You can use:
旧：您可以使用：
TxtInput.Text = TxtInput.Text.ToString().Remove(TxtInput.Text.ToString().Length-1,1);
