Random.Next Method (Int32, Int32)
Returns a random integer that is within a specified range.
Assembly: mscorlib (in mscorlib.dll)
abstract Next : minValue:int * maxValue:int -> int override Next : minValue:int * maxValue:int -> int
- Type: System.Int32
The inclusive lower bound of the random number returned.
- Type: System.Int32
The exclusive upper bound of the random number returned. maxValue must be greater than or equal to minValue.
Return ValueType: System.Int32
A 32-bit signed integer greater than or equal to minValue and less than maxValue; that is, the range of return values includes minValue but not maxValue. If minValue equals maxValue, minValue is returned.
The overload returns random integers that range from minValue to maxValue – 1. However, if maxValue equals minValue, the method returns minValue.
Unlike the other overloads of the Next method, which return only non-negative values, this method can return a negative random integer.Notes to Inheritors
Starting with the .NET Framework version 2.0, if you derive a class from Random and override the Sample method, the distribution provided by the derived class implementation of the Sample method is not used in calls to the base class implementation of the method overload if the difference between the minValue and maxValue parameters is greater than Int32.MaxValue. Instead, the uniform distribution returned by the base Random class is used. This behavior improves the overall performance of the Random class. To modify this behavior to call the Sample method in the derived class, you must also override the method overload.
The following example uses the method to generate random integers with three distinct ranges. Note that the exact output from the example depends on the system-supplied seed value passed to the Random class constructor.
The following example generates a random integer that it uses as an index to retrieve a string value from an array. Because the highest index of the array is one less than its length, the value of the Array.Length property is supplied as a the maxValue parameter.
.NET FrameworkSupported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
XNA FrameworkSupported in: 3.0, 2.0, 1.0
Portable Class LibrarySupported in: Portable Class Library
Supported in: Windows Phone 8.1
Supported in: Windows Phone Silverlight 8.1
Supported in: Windows Phone Silverlight 8