Version.CompareTo 方法

定義

命名空間:

System

組件:

netstandard.dll, System.Runtime.dll

將目前 Version 物件與指定物件或 Version 相比較，並傳回其相對值的指示。

多載

CompareTo(Version)	將目前 Version 物件與指定的 Version 物件相比較，並傳回其相對值的指示。
CompareTo(Object)	將目前 Version 物件與指定物件相比較，並傳回其相對值的指示。

CompareTo(Version)

來源:

Version.cs

將目前 Version 物件與指定的 Version 物件相比較，並傳回其相對值的指示。

C#

public int CompareTo(Version? value);

參數

value

Version

要與目前 Version 物件比較的 Version 物件，否則為 null。

傳回

Int32

帶正負號的整數，表示兩個物件的相對值，如下表所示。

傳回值	意義
小於零	目前的 Version 物件是 value 之前的版本。
零	目前的 Version 物件與 value 是相同版本。
大於零	目前的 Version 物件是 value 的後續版本，或者 value 為 null。

實作

CompareTo(T)

範例

下列程式碼範例示範數個值和參考型別之 方法的 CompareTo 泛型和非泛型版本。

C#

// This example demonstrates the generic and non-generic versions of the
// CompareTo method for several base types.
// The non-generic version takes a parameter of type Object, while the generic
// version takes a type-specific parameter, such as Boolean, Int32, or Double.

using System;

class Sample
{
    public static void Main()
    {
    string    nl = Environment.NewLine;
    string    msg = "{0}The following is the result of using the generic and non-generic{0}" +
                    "versions of the CompareTo method for several base types:{0}";

    DateTime  now = DateTime.Now;
// Time span = 11 days, 22 hours, 33 minutes, 44 seconds
    TimeSpan  tsX = new TimeSpan(11, 22, 33, 44);
// Version = 1.2.333.4
    Version   versX = new Version("1.2.333.4");
// Guid = CA761232-ED42-11CE-BACD-00AA0057B223
    Guid      guidX = new Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}");

    Boolean  a1 = true,  a2 = true;
    Byte     b1 = 1,     b2 = 1;
    Int16    c1 = -2,    c2 = 2;
    Int32    d1 = 3,     d2 = 3;
    Int64    e1 = 4,     e2 = -4;
    Decimal  f1 = -5.5m, f2 = 5.5m;
    Single   g1 = 6.6f,  g2 = 6.6f;
    Double   h1 = 7.7d,  h2 = -7.7d;
    Char     i1 = 'A',   i2 = 'A';
    String   j1 = "abc", j2 = "abc";
    DateTime k1 = now,   k2 = now;
    TimeSpan l1 = tsX,   l2 = tsX;
    Version  m1 = versX, m2 = new Version("2.0");
    Guid     n1 = guidX, n2 = guidX;

// The following types are not CLS-compliant.
    SByte    w1 = 8,     w2 = 8;
    UInt16   x1 = 9,     x2 = 9;
    UInt32   y1 = 10,    y2 = 10;
    UInt64   z1 = 11,    z2 = 11;
//
    Console.WriteLine(msg, nl);
    try
        {
// The second and third Show method call parameters are automatically boxed because
// the second and third Show method declaration arguments expect type Object.

        Show("Boolean:  ", a1, a2, a1.CompareTo(a2), a1.CompareTo((Object)a2));
        Show("Byte:     ", b1, b2, b1.CompareTo(b2), b1.CompareTo((Object)b2));
        Show("Int16:    ", c1, c2, c1.CompareTo(c2), c1.CompareTo((Object)c2));
        Show("Int32:    ", d1, d2, d1.CompareTo(d2), d1.CompareTo((Object)d2));
        Show("Int64:    ", e1, e2, e1.CompareTo(e2), e1.CompareTo((Object)e2));
        Show("Decimal:  ", f1, f2, f1.CompareTo(f2), f1.CompareTo((Object)f2));
        Show("Single:   ", g1, g2, g1.CompareTo(g2), g1.CompareTo((Object)g2));
        Show("Double:   ", h1, h2, h1.CompareTo(h2), h1.CompareTo((Object)h2));
        Show("Char:     ", i1, i2, i1.CompareTo(i2), i1.CompareTo((Object)i2));
        Show("String:   ", j1, j2, j1.CompareTo(j2), j1.CompareTo((Object)j2));
        Show("DateTime: ", k1, k2, k1.CompareTo(k2), k1.CompareTo((Object)k2));
        Show("TimeSpan: ", l1, l2, l1.CompareTo(l2), l1.CompareTo((Object)l2));
        Show("Version:  ", m1, m2, m1.CompareTo(m2), m1.CompareTo((Object)m2));
        Show("Guid:     ", n1, n2, n1.CompareTo(n2), n1.CompareTo((Object)n2));
//
        Console.WriteLine("{0}The following types are not CLS-compliant:", nl);
        Show("SByte:    ", w1, w2, w1.CompareTo(w2), w1.CompareTo((Object)w2));
        Show("UInt16:   ", x1, x2, x1.CompareTo(x2), x1.CompareTo((Object)x2));
        Show("UInt32:   ", y1, y2, y1.CompareTo(y2), y1.CompareTo((Object)y2));
        Show("UInt64:   ", z1, z2, z1.CompareTo(z2), z1.CompareTo((Object)z2));
        }
    catch (Exception e)
        {
        Console.WriteLine(e);
        }
    }

    public static void Show(string caption, Object var1, Object var2,
                            int resultGeneric, int resultNonGeneric)
    {
    string relation;

    Console.Write(caption);
    if (resultGeneric == resultNonGeneric)
        {
        if      (resultGeneric < 0) relation = "less than";
        else if (resultGeneric > 0) relation = "greater than";
        else                        relation = "equal to";
        Console.WriteLine("{0} is {1} {2}", var1, relation, var2);
        }

// The following condition will never occur because the generic and non-generic
// CompareTo methods are equivalent.

    else
        {
        Console.WriteLine("Generic CompareTo = {0}; non-generic CompareTo = {1}",
                           resultGeneric, resultNonGeneric);
        }
   }
}
/*
This example produces the following results:

The following is the result of using the generic and non-generic versions of the
CompareTo method for several base types:

Boolean:  True is equal to True
Byte:     1 is equal to 1
Int16:    -2 is less than 2
Int32:    3 is equal to 3
Int64:    4 is greater than -4
Decimal:  -5.5 is less than 5.5
Single:   6.6 is equal to 6.6
Double:   7.7 is greater than -7.7
Char:     A is equal to A
String:   abc is equal to abc
DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
TimeSpan: 11.22:33:44 is equal to 11.22:33:44
Version:  1.2.333.4 is less than 2.0
Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42-11ce-bacd-00
aa0057b223

The following types are not CLS-compliant:
SByte:    8 is equal to 8
UInt16:   9 is equal to 9
UInt32:   10 is equal to 10
UInt64:   11 is equal to 11
*/

備註

這個方法會實作 System.IComparable<T> 介面，並執行比 CompareTo 方法稍微好一點，因為它不需要取消收件匣 value 參數。

重要性遞減順序的 Version 元件包括：主要、次要、建置和修訂。 假設未知的元件比任何已知元件還舊。 例如：

• 1.1 版比 1.1.0 版還舊。

• 1.1 版比 1.1.1 版還舊。

• 1.1 版比 1.1.2.3 版還舊。

• 1.1.2 版早于 1.1.2.4 版。

• 1.2.5 版比 1.2.3.4 版還新。

CompareTo(Object)

來源:

Version.cs

將目前 Version 物件與指定物件相比較，並傳回其相對值的指示。

C#

public int CompareTo(object? version);

參數

version

Object

要比較的物件或 null。

傳回

Int32

帶正負號的整數，表示兩個物件的相對值，如下表所示。

傳回值	意義
小於零	目前的 Version 物件是 version 之前的版本。
零	目前的 Version 物件與 version 是相同版本。
大於零	目前的 Version 物件是 version 的後續版本，或者 version 為 null。

實作

CompareTo(Object)

例外狀況

ArgumentException

version 不是 Version型別。

備註

重要性遞減順序的 Version 元件包括：主要、次要、建置和修訂。 假設未知的元件比任何已知元件還舊。

例如：

• 1.1 版早于 1.1.0 版

• 1.1 版早于 1.1.1 版

• 1.1 版早于 1.1.2.3 版

• 1.1.2 版早于 1.1.2.4 版

• 1.2.5 版比 1.2.3.4 版還新

另請參閱

• CompareTo(Version)
• Equals