WPF TextBox 输入限制小数点后两位

Posted 2022-01-27 mingsonzheng

private void TextBox_OnPreviewKeyUp(object sender, KeyEventArgs e)

    var textBox = e.OriginalSource as TextBox;
    if (textBox != null)
    
        if (!string.IsNullOrWhiteSpace(textBox.Text))
        
            if (textBox.Text.Substring(textBox.Text.Length-1) != ".")
            
                if (!textBox.Text.Contains("."))
                
                    textBox.MaxLength = 10;
                

                if (decimal.TryParse(textBox.Text, out var anyAmount))
                
                    // Text成功转为deciml后逻辑
                
            
            else
            
                textBox.MaxLength = textBox.Text.Length + 2;
            
        
        else
        
            // Text为空逻辑