共用方式為


BigInteger.IComparable.CompareTo(Object) 方法

定義

比較這個執行個體與特定物件,並且傳回一個整數,指出這個執行個體的值是小於、等於或大於特定物件的值。

 virtual int System.IComparable.CompareTo(System::Object ^ obj) = IComparable::CompareTo;
int IComparable.CompareTo (object obj);
abstract member System.IComparable.CompareTo : obj -> int
override this.System.IComparable.CompareTo : obj -> int
Function CompareTo (obj As Object) As Integer Implements IComparable.CompareTo

參數

obj
Object

要比較的物件。

傳回

帶正負號的整數,表示目前執行個體與 obj 參數的關聯性,如下表所示。

傳回值 描述
小於零 目前的執行個體小於 obj
目前的執行個體等於 obj
大於零 目前執行個體大於 obj,或者 obj 參數為 null

實作

例外狀況

範例

下列範例會 CompareTo(Object) 呼叫 方法,以比較 BigInteger 值與物件陣列中的每個元素:

object[] values = { BigInteger.Pow(Int64.MaxValue, 10), null,
                    12.534, Int64.MaxValue, BigInteger.One };
BigInteger number = UInt64.MaxValue;

foreach (object value in values)
{
   try {
      Console.WriteLine("Comparing {0} with '{1}': {2}", number, value,
                        number.CompareTo(value));
   }
   catch (ArgumentException) {
      Console.WriteLine("Unable to compare the {0} value {1} with a BigInteger.",
                        value.GetType().Name, value);
   }
}
// The example displays the following output:
//    Comparing 18446744073709551615 with '4.4555084156466750133735972424E+189': -1
//    Comparing 18446744073709551615 with '': 1
//    Unable to compare the Double value 12.534 with a BigInteger.
//    Unable to compare the Int64 value 9223372036854775807 with a BigInteger.
//    Comparing 18446744073709551615 with '1': 1
let values =
    [| BigInteger.Pow(Int64.MaxValue, 10)
       Unchecked.defaultof<bigint>
       bigint 12.534
       Int64.MaxValue
       BigInteger.One |]

let number = bigint UInt64.MaxValue

for value in values do
    try
        printfn $"Comparing {number} with '{value}': {number.CompareTo value}"
    with :? ArgumentException as e ->
        printfn $"Unable to compare the {value.GetType().Name} value {value} with a BigInteger."
// The example displays the following output:
//    Comparing 18446744073709551615 with '4.4555084156466750133735972424E+189': -1
//    Comparing 18446744073709551615 with '': 1
//    Unable to compare the Double value 12.534 with a BigInteger.
//    Unable to compare the Int64 value 9223372036854775807 with a BigInteger.
//    Comparing 18446744073709551615 with '1': 1
Dim values() As Object = { BigInteger.Pow(Int64.MaxValue, 10), Nothing, 
                           12.534, Int64.MaxValue, BigInteger.One }
Dim number As BigInteger = UInt64.MaxValue

For Each value As Object In values
   Try
      Console.WriteLine("Comparing {0} with '{1}': {2}", number, value, 
                        number.CompareTo(value))
   Catch e As ArgumentException
      Console.WriteLine("Unable to compare the {0} value {1} with a BigInteger.",
                        value.GetType().Name, value)
   End Try                     
Next                                 
' The example displays the following output:
'    Comparing 18446744073709551615 with '4.4555084156466750133735972424E+189': -1
'    Comparing 18446744073709551615 with '': 1
'    Unable to compare the Double value 12.534 with a BigInteger.
'    Unable to compare the Int64 value 9223372036854775807 with a BigInteger.
'    Comparing 18446744073709551615 with '1': 1

備註

參數 obj 必須是下列其中一項:

  • 運行時間類型為 BigInteger的物件。

  • 值為 Objectnull變數。 如果 參數的值 objnull,則方法會傳回 1,表示目前的實例大於 obj

適用於

另請參閱