如何判断某一个object对象是某个具体类的实例,或与该类类型相同? object o;bool result=o is type;type t=o as type;如,判断o是否为Formbool result=o is Form;Form f=o as Form; 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 .NET Framework 类库 Object.Equals 方法 [C#]请参见Object 类 | Object 成员 | System 命名空间 | C++ 托管扩展编程 语言C#C++JScriptVisual Basic全部显示确定两个 Object 实例是否相等。重载列表确定指定的 Object 是否等于当前的 Object。受 .NET Framework 精简版的支持。[Visual Basic] Overloads Public Overridable Function Equals(Object) As Boolean[C#] public virtual bool Equals(object);[C++] public: virtual bool Equals(Object*);[JScript] public function Equals(Object) : Boolean;确定指定的 Object 实例是否被视为相等。[Visual Basic] Overloads Public Shared Function Equals(Object, Object) As Boolean[C#] public static bool Equals(object, object);[C++] public: static bool Equals(Object*, Object*);[JScript] public static function Equals(Object, Object) : Boolean;示例[C#, JScript] 下面的代码示例比较不同的对象。[C#, JScript] 注意 此示例显示如何使用 Equals 的一个重载版本。有关其他可用示例,请参阅单独的重载主题。[C#] using System;public class MyClass { public static void Main() { string s1 = "Tom"; string s2 = "Carol"; Console.WriteLine("Object.Equals(\"{0}\", \"{1}\") => {2}", s1, s2, Object.Equals(s1, s2)); s1 = "Tom"; s2 = "Tom"; Console.WriteLine("Object.Equals(\"{0}\", \"{1}\") => {2}", s1, s2, Object.Equals(s1, s2)); s1 = null; s2 = "Tom"; Console.WriteLine("Object.Equals(null, \"{1}\") => {2}", s1, s2, Object.Equals(s1, s2)); s1 = "Carol"; s2 = null; Console.WriteLine("Object.Equals(\"{0}\", null) => {2}", s1, s2, Object.Equals(s1, s2)); s1 = null; s2 = null; Console.WriteLine("Object.Equals(null, null) => {2}", s1, s2, Object.Equals(s1, s2)); }}/*This code produces the following output.Object.Equals("Tom", "Carol") => FalseObject.Equals("Tom", "Tom") => TrueObject.Equals(null, "Tom") => FalseObject.Equals("Carol", null) => FalseObject.Equals(null, null) => True*/[JScript] import Systempackage Equals0{ public class MyClass { public static function Main() { var s1 : String = "Tom"; var s2 : String = "Carol"; var array : Object [] = new Object[3]; array[0] = s1; array[1] = s2; array[2] = System.Object.Equals(s1, s2); Console.WriteLine("Object.Equals('{0}', '{1}') => {2}", array); s1 = "Tom"; s2 = "Tom"; array[0] = s1; array[1] = s2; array[2] = System.Object.Equals(s1, s2); Console.WriteLine("Object.Equals('{0}', '{1}') => {2}", array); s1 = null; s2 = "Tom"; array[0] = s1; array[1] = s2; array[2] = System.Object.Equals(s1, s2); Console.WriteLine("Object.Equals(null, '{1}') => {2}", array); s1 = "Carol"; s2 = null; array[0] = s1; array[1] = s2; array[2] = System.Object.Equals(s1, s2); Console.WriteLine("Object.Equals('{0}', null) => {2}", array); s1 = null; s2 = null; array[0] = s1; array[1] = s2; array[2] = System.Object.Equals(s1, s2); Console.WriteLine("Object.Equals(null, null) => {2}", array); } }}Equals0.MyClass.Main();/*This code produces the following output.Object.Equals("Tom", "Carol") => FalseObject.Equals("Tom", "Tom") => TrueObject.Equals(null, "Tom") => FalseObject.Equals("Carol", null) => FalseObject.Equals(null, null) => True*/[Visual Basic, C++] 没有可用于 Visual Basic 或 C++ 的示例。若要查看 C# 或 JScript 示例,请单击页左上角的“语言筛选器”按钮 。请参见Object 类 | Object 成员 | System 命名空间 | C++ 托管扩展编程 --------------------------------------------------------------------------------发送有关此主题的意见 © 2001-2002 Microsoft Corporation。保留所有权利。 求一个c#小程序(急用) XML问题:SelectNodes,SelectSingleNode方法使用 C#读取XML 求RFC 4648,1939,2045中文文档 vs2005使用皮肤控件,代码怎么写 问一个批处理的问题 曲线上点的坐标 "查询值的数目与目标字段中的数目不同" 突然发现又掉入一下C#基础知识坑里了。请教大家了。 Visual C#加载窗体错误! 关于“在Internet Explorer中使用Windows窗体控件”的一点困惑 请问BT的触发端口和接收端口一般是多少的?
Object 类 | Object 成员 | System 命名空间 | C++ 托管扩展编程
语言
C#C++JScriptVisual Basic全部显示
确定两个 Object 实例是否相等。重载列表
确定指定的 Object 是否等于当前的 Object。受 .NET Framework 精简版的支持。[Visual Basic] Overloads Public Overridable Function Equals(Object) As Boolean
[C#] public virtual bool Equals(object);
[C++] public: virtual bool Equals(Object*);
[JScript] public function Equals(Object) : Boolean;
确定指定的 Object 实例是否被视为相等。[Visual Basic] Overloads Public Shared Function Equals(Object, Object) As Boolean
[C#] public static bool Equals(object, object);
[C++] public: static bool Equals(Object*, Object*);
[JScript] public static function Equals(Object, Object) : Boolean;
示例
[C#, JScript] 下面的代码示例比较不同的对象。[C#, JScript] 注意 此示例显示如何使用 Equals 的一个重载版本。有关其他可用示例,请参阅单独的重载主题。
[C#]
using System;public class MyClass {
public static void Main() {
string s1 = "Tom";
string s2 = "Carol";
Console.WriteLine("Object.Equals(\"{0}\", \"{1}\") => {2}",
s1, s2, Object.Equals(s1, s2)); s1 = "Tom";
s2 = "Tom";
Console.WriteLine("Object.Equals(\"{0}\", \"{1}\") => {2}",
s1, s2, Object.Equals(s1, s2)); s1 = null;
s2 = "Tom";
Console.WriteLine("Object.Equals(null, \"{1}\") => {2}",
s1, s2, Object.Equals(s1, s2)); s1 = "Carol";
s2 = null;
Console.WriteLine("Object.Equals(\"{0}\", null) => {2}",
s1, s2, Object.Equals(s1, s2)); s1 = null;
s2 = null;
Console.WriteLine("Object.Equals(null, null) => {2}",
s1, s2, Object.Equals(s1, s2));
}
}
/*This code produces the following output.Object.Equals("Tom", "Carol") => False
Object.Equals("Tom", "Tom") => True
Object.Equals(null, "Tom") => False
Object.Equals("Carol", null) => False
Object.Equals(null, null) => True*/[JScript]
import Systempackage Equals0
{ public class MyClass {
public static function Main() {
var s1 : String = "Tom";
var s2 : String = "Carol";
var array : Object [] = new Object[3]; array[0] = s1;
array[1] = s2;
array[2] = System.Object.Equals(s1, s2); Console.WriteLine("Object.Equals('{0}', '{1}') => {2}",
array); s1 = "Tom";
s2 = "Tom";
array[0] = s1;
array[1] = s2;
array[2] = System.Object.Equals(s1, s2);
Console.WriteLine("Object.Equals('{0}', '{1}') => {2}",
array); s1 = null;
s2 = "Tom";
array[0] = s1;
array[1] = s2;
array[2] = System.Object.Equals(s1, s2);
Console.WriteLine("Object.Equals(null, '{1}') => {2}",
array); s1 = "Carol";
s2 = null;
array[0] = s1;
array[1] = s2;
array[2] = System.Object.Equals(s1, s2);
Console.WriteLine("Object.Equals('{0}', null) => {2}",
array); s1 = null;
s2 = null;
array[0] = s1;
array[1] = s2;
array[2] = System.Object.Equals(s1, s2);
Console.WriteLine("Object.Equals(null, null) => {2}",
array);
}
}}Equals0.MyClass.Main();
/*This code produces the following output.Object.Equals("Tom", "Carol") => False
Object.Equals("Tom", "Tom") => True
Object.Equals(null, "Tom") => False
Object.Equals("Carol", null) => False
Object.Equals(null, null) => True*/[Visual Basic, C++] 没有可用于 Visual Basic 或 C++ 的示例。若要查看 C# 或 JScript 示例,请单击页左上角的“语言筛选器”按钮 。请参见
Object 类 | Object 成员 | System 命名空间 | C++ 托管扩展编程
--------------------------------------------------------------------------------发送有关此主题的意见 © 2001-2002 Microsoft Corporation。保留所有权利。