Percentage calculation

问题

I am working in progress bar concept in ASP.NET MVC 2. Here i have a DropDownList which has 10 values. i want to calculate the percentage for progress bar, e.g. 10 values from DropDownList and i am having a query which returns the value 2. so, out of 10 values i am getting 2. "20 % completed" should be displayed.. How to do this calculation

回答1:

(current / maximum) * 100. In your case, (2 / 10) * 100.

回答2:

Using Math.Round():

int percentComplete = (int)Math.Round((double)(100 * complete) / total);

or manually rounding:

int percentComplete = (int)(0.5f + ((100f * complete) / total));

回答3:

With C# String formatting you can avoid the multiplication by 100 as it will make the code shorter and cleaner especially because of less brackets and also the rounding up code can be avoided.

(current / maximum).ToString("0.00%");

// Output - 16.67%

回答4:

Mathematically, to get percentage from two numbers:

percentage = (yourNumber / totalNumber) * 100;

And also, to calculate from a percentage :

number = (percentage / 100) * totalNumber;

回答5:

You can hold onto the percentage as decimal (value \ total) and then when you want to render to a human you can make use of Habeeb's answer or using string interpolation you could have something even cleaner:

var displayPercentage = $"{(decimal)value / total:P}";

or

//Calculate percentage earlier in code
decimal percentage = (decimal)value / total;
...
//Now render percentage
var displayPercentage = $"{percentage:P}";

来源：https://stackoverflow.com/questions/4561374/percentage-calculation