Winform TextBox中只能输入数字的几种常用方法(C#)

╰+哭是因爲堅強的太久メ 2023-08-17 17:36 69阅读 0赞

原文出自 浆糊033，链接：[https://www.cnblogs.com/maxin991025-/p/6219681.html][https_www.cnblogs.com_maxin991025-_p_6219681.html]

方法一： 
    
    private void tBox_KeyPress(object sender, KeyPressEventArgs e) 
    
    { 
    if (e.KeyChar == 0x20) e.KeyChar = (char)0; //禁止空格键 
    if ((e.KeyChar == 0x2D) && (((TextBox)sender).Text.Length == 0)) return; //处理负数 
    if (e.KeyChar > 0x20) 
    { 
    try 
    { 
    double.Parse(((TextBox)sender).Text + e.KeyChar.ToString()); 
    } 
    catch 
    { 
    e.KeyChar = (char)0; //处理非法字符 
    } 
    } 
    } 
    
    方法二： 
    
    private void TextBox_KeyPress(object sender, KeyPressEventArgs e) 
    { 
    if(e.KeyChar!=8&&!Char.IsDigit(e.KeyChar)) 
    { 
    e.Handled = true; 
    } 
    } 
    或者 
    
    private void TextBox_KeyPress(object sender, KeyPressEventArgs e) 
    { 
    if(e.KeyChar!='\b'&&!Char.IsDigit(e.KeyChar)) 
    { 
    e.Handled = true; 
    } 
    
    } 
    
    方法三: 
    
    private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) 
    { 
    if(e.KeyChar!='\b')//这是允许输入退格键 
    { 
    if((e.KeyChar<'0')||(e.KeyChar>'9'))//这是允许输入0-9数字 
    { 
    e.Handled = true; 
    } 
    } 
    } 
    
    方法四: 
    
    private void textBox1_Validating(object sender, CancelEventArgs e) 
    { 
    const string pattern = @"^\d+\.?\d+{1}quot;; 
    string content = ((TextBox)sender).Text; 
    
    if (!(Regex.IsMatch(content, pattern))) 
    { 
    errorProvider1.SetError((Control)sender, "只能输入数字!"); 
    e.Cancel = true; 
    } 
    else 
    errorProvider1.SetError((Control)sender, null); 
    } 
    
    方法五: 
    
    private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) 
    { 
    if(e.KeyChar=='.' && this.textBox1.Text.IndexOf(".")!=-1) 
    { 
    e.Handled=true; 
    } 
    
    if(!((e.KeyChar>=48 && e.KeyChar<=57) || e.KeyChar=='.' || e.KeyChar==8)) 
    { 
    e.Handled=true; 
    } 
    
    } 
    
    方法六： 
    
    private void tbx_LsRegCapital_KeyPress(object sender, KeyPressEventArgs e) 
    { 
    if (!Char.IsNumber(e.KeyChar) && !Char.IsPunctuation(e.KeyChar) && !Char.IsControl(e.KeyChar)) 
    { 
    e.Handled = true;//消除不合适字符 
    } 
    else if (Char.IsPunctuation(e.KeyChar)) 
    { 
    if (e.KeyChar != '.' || this.textBox1.Text.Length == 0)//小数点 
    { 
    e.Handled = true; 
    } 
    if (textBox1.Text.LastIndexOf('.') != -1) 
    { 
    e.Handled = true; 
    } 
    } 
    } 
    
    方法七: 
    
    利用ASCII码处理办法、 
    { 
    
    if ((e.KeyChar <= 48 || e.KeyChar >=57) && (e.KeyChar != 8) && (e.KeyChar != 46)) 
    e.Handled = true; 
    ================48代表0，57代表9，8代表空格，46代表小数点 
    }

转载于:https://www.cnblogs.com/chenboyhd/p/11312428.html

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