CompareTo Method (Object)
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UInt64.CompareTo Method (Object)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Compares this instance to a specified object and returns an integer that indicates whether the value of this instance is greater than, equal to, or less than the value of the specified object.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public int CompareTo(
	Object value


Type: System.Object
An object to compare, or null.

Return Value

Type: System.Int32
A signed number indicating the relative values of this instance and value.

Return Value


Less than zero

This instance is less than value.


This instance is equal to value.

Greater than zero

This instance is greater than value.


value is null.




value is not a UInt64.

Any instance of UInt64, regardless of its value, is considered greater than null.

value must be null or an instance of UInt64; otherwise, an exception is thrown.

The following code example demonstrates the CompareTo method.

public class Temperature : IComparable
   /// <summary>
   /// IComparable.CompareTo implementation.
   /// </summary>
   public int CompareTo(object obj)
      if (obj is Temperature)
         Temperature temp = (Temperature)obj;

         return m_value.CompareTo(temp.m_value);

      throw new ArgumentException("object is not a Temperature");

   // The value holder
   protected ulong m_value;

   public ulong Value
         return m_value;
         m_value = value;

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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