幣別控制金額小數位數方法

//根據幣別控制金額小數位數

private void DigitalControl()

{

// 控制項：設定單價UnitPrice,設定資本DealAmt,買進/賣出成本DealCost,應收付金額NetAmt

System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();

 

     if(this.lblDecLength.Text.Trim() !="")

     {

           int intDecLen = System.Convert.ToInt32(this.lblDecLength.Text.Trim());

           provider.NumberDecimalDigits = intDecLen;

           double dblDealAmt,dblDealCost,dblNetAmt; //dblUnitPrice

//         if (this.txtUnitPrice.Text.Trim() !="")    // 設定單價

//         {

//              dblUnitPrice =System.Convert.ToDouble(this.txtUnitPrice.Text.Trim());

//         }

//         else

//         {

//              dblUnitPrice = 0;

//         }

//          txtUnitPrice.Text = dblUnitPrice.ToString("N", provider);

                          

           if(this.txtDealAmt.Text.Trim() !="") // 設定資本

           {

                dblDealAmt =System.Convert.ToDouble(this.txtDealAmt.Text.Trim());

           }

           else

           {

                dblDealAmt = 0;

           }

           txtDealAmt.Text = dblDealAmt.ToString("N", provider);

                          

           if(this.txtDealCost.Text.Trim() !="") // 買進/賣出成本

           {

                dblDealCost =System.Convert.ToDouble(this.txtDealCost.Text.Trim());

           }

           else

           {

                dblDealCost = 0;

           }

           txtDealCost.Text = dblDealCost.ToString("N", provider);   

                          

           if(this.txtNetAmt.Text.Trim() !="") // 應收付金額

           {

                dblNetAmt =System.Convert.ToDouble(this.txtNetAmt.Text.Trim());

           }

           else

           {

                dblNetAmt = 0;

           }

           txtNetAmt.Text = dblNetAmt.ToString("N", provider);

 

                     //this.txtUnitPrice.DecimalDigit=Convert.ToInt32(this.lblDecLength.Text.Trim());     // 控制設定單價的小數位數

                     this.txtDealAmt.DecimalDigit=Convert.ToInt32(this.lblDecLength.Text.Trim());    // 控制設定資本的小數位數

                     this.txtDealCost.DecimalDigit=Convert.ToInt32(this.lblDecLength.Text.Trim());   // 控制買進/賣出成本的小數位數

                     this.txtNetAmt.DecimalDigit=Convert.ToInt32(this.lblDecLength.Text.Trim());          // 控制應收付金額的小數位數

     }

}

總結：

System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();

 

provider.NumberDecimalDigits = 2;     // 小数点保留几位数 .

double result = (double) 123.00000 ;    // 一定要用 double 类型 .

string d = result.ToString(" N " , provider); //result:d=123.00

  

Reference:

1.控制百分數方法

System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();

 

provider.PercentDecimalDigits = 2;    // 小数点保留几位数 .

provider.PercentPositivePattern = 2; // 百分号出现在何处 .

double result = (double)1 / 3;   // 一定要用 double 类型 .

string d = result.ToString("P", provider); //result:d=%33.33

2.控制货币值中小數方法

System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();

 

provider.CurrencyDecimalDigits= 2;    // 小数点保留几位数 .

double result = (double)1234;  

string d = result.ToString(" C " , provider); //result:d=1234.00

 

[C#]

using System;

using System.Globalization;

class NumberFormatInfoSample {

   public static void Main() {

      // Gets a NumberFormatInfo associated with the en-US culture.

      NumberFormatInfo nfi = new CultureInfo( "en-US", false ).NumberFormat;

      // Displays a negative value with the default number of decimal digits (2).

      Int64 myInt = -1234;

      Console.WriteLine( myInt.ToString( "C", nfi ) );

      // Displays the same value with four decimal digits.

      nfi.CurrencyDecimalDigits = 4;

      Console.WriteLine( myInt.ToString( "C", nfi ) );

   }

}

/* 

This code produces the following output.

($1,234.00)

($1,234.0000)

*/