如何将label.text显示或格式化为currency和double [英] How to display or format label.text to currency and double

问题描述

我有一个datagridview，它有鼠标点击事件处理程序，我的列Rate_Per_Day值= 602.55，然后它将显示在我的Rate_Per_Day标签中。在我的标签中显示为602.545454545455。如何将其显示为货币并加倍。谢谢



我的尝试：

<预> private void dataGridView2_MouseClick（object sender，MouseEventArgs e）
 {
 
 lbl_nameUPDATE.Text = dataGridView2.SelectedRows [0] .Cells [Name]。Value.ToString（）; 
 txtPosition2.Text = dataGridView2.SelectedRows [0] .Cells [Position]。Value.ToString（）; 
 comboBox2.Text = dataGridView2.SelectedRows [0] .Cells [Division_Unit_Section]。Value.ToString（）; 
 txtMonthly_Rate2.Text = dataGridView2.SelectedRows [0] .Cells [Monthly_Rate]。Value.ToString（）; 
 lbl_RatePerDay.Text = dataGridView2.SelectedRows [0] .Cells [Rate_Per_Day]。Value.ToString（）; 

解决方案

< blockquote>怎么样：

 lbl_RatePerDay.Text = dataGridView2.SelectedRows [0] .Cells [Rate_Per_Day]。Value.ToString（。00）; 

Value 属性返回对象，这不是没有标准的格式化选项。



快速而肮脏的修复方法是使用 string.Format ：

 lbl_RatePerDay.Text =  string  .Format（  {0：F2}，dataGridView2.SelectedRows [ 0 ]。单元格[   Rate_Per_Day]。价值）; 

A更完整的修复方法是创建自己的扩展方法：

  public   static   class  FormattingExtensions 
 {
  public   static   string  ToString（ this   object  obj， string 格式，IFormatProvider formatProvider =  null ）
 {
  if （obj ==  null ） throw   new  NullReferenceException（）; 
 
  var  formattable = obj  as  IFormattable; 
  if （formattable ==  null ） return  obj.ToString（）; 
  return  formattable.ToString（format，formatProvider）; 
} 
} 

使用：

 lbl_RatePerDay.Text = dataGridView2.SelectedRows [ 0  ] .Cells [  Rate_Per_Day]。Value.ToString（  F2）; 

I have a datagridview that has on mouse click event handler where my column "Rate_Per_Day" value = 602.55 and then it will display in my Rate_Per_Day label. In my label it displays as 602.545454545455. How can I display it as a currency and double. Thanks

What I have tried:

<pre>  private void dataGridView2_MouseClick(object sender, MouseEventArgs e)
        {                  
                
                lbl_nameUPDATE.Text = dataGridView2.SelectedRows[0].Cells["Name"].Value.ToString();                    
                txtPosition2.Text = dataGridView2.SelectedRows[0].Cells["Position"].Value.ToString();
                comboBox2.Text = dataGridView2.SelectedRows[0].Cells["Division_Unit_Section"].Value.ToString();
                txtMonthly_Rate2.Text = dataGridView2.SelectedRows[0].Cells["Monthly_Rate"].Value.ToString();
                lbl_RatePerDay.Text = dataGridView2.SelectedRows[0].Cells["Rate_Per_Day"].Value.ToString();

解决方案

How about:

lbl_RatePerDay.Text = dataGridView2.SelectedRows[0].Cells["Rate_Per_Day"].Value.ToString(".00");

The Value property returns an object, which doesn't have the standard formatting options.

The quick-and-dirty fix is to use string.Format:

lbl_RatePerDay.Text = string.Format("{0:F2}", dataGridView2.SelectedRows[0].Cells["Rate_Per_Day"].Value);

A more complete fix would be to create your own extension method:

public static class FormattingExtensions
{
    public static string ToString(this object obj, string format, IFormatProvider formatProvider = null)
    {
        if (obj == null) throw new NullReferenceException();
        
        var formattable = obj as IFormattable;
        if (formattable == null) return obj.ToString();
        return formattable.ToString(format, formatProvider);
    }
}

Use:

lbl_RatePerDay.Text = dataGridView2.SelectedRows[0].Cells["Rate_Per_Day"].Value.ToString("F2");

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