本文整理汇总了C#中System.Collections.ArrayList.ReadOnly方法的典型用法代码示例。如果您正苦于以下问题：C# ArrayList.ReadOnly方法的具体用法？C# ArrayList.ReadOnly怎么用？C# ArrayList.ReadOnly使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Collections.ArrayList的用法示例。
在下文中一共展示了ArrayList.ReadOnly方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
//引入命名空间
using System;
using System.Collections;
public class SamplesArrayList {
public static void Main() {
// Creates and initializes a new ArrayList.
ArrayList myAL = new ArrayList();
myAL.Add( "red" );
myAL.Add( "orange" );
myAL.Add( "yellow" );
// Creates a read-only copy of the ArrayList.
ArrayList myReadOnlyAL = ArrayList.ReadOnly( myAL );
// Displays whether the ArrayList is read-only or writable.
Console.WriteLine( "myAL is {0}.", myAL.IsReadOnly ? "read-only" : "writable" );
Console.WriteLine( "myReadOnlyAL is {0}.", myReadOnlyAL.IsReadOnly ? "read-only" : "writable" );
// Displays the contents of both collections.
Console.WriteLine( "\nInitially," );
Console.WriteLine( "The original ArrayList myAL contains:" );
foreach ( String myStr in myAL )
Console.WriteLine( " {0}", myStr );
Console.WriteLine( "The read-only ArrayList myReadOnlyAL contains:" );
foreach ( String myStr in myReadOnlyAL )
Console.WriteLine( " {0}", myStr );
// Adding an element to a read-only ArrayList throws an exception.
Console.WriteLine( "\nTrying to add a new element to the read-only ArrayList:" );
try {
myReadOnlyAL.Add("green");
} catch ( Exception myException ) {
Console.WriteLine("Exception: " + myException.ToString());
}
// Adding an element to the original ArrayList affects the read-only ArrayList.
myAL.Add( "blue" );
// Displays the contents of both collections again.
Console.WriteLine( "\nAfter adding a new element to the original ArrayList," );
Console.WriteLine( "The original ArrayList myAL contains:" );
foreach ( String myStr in myAL )
Console.WriteLine( " {0}", myStr );
Console.WriteLine( "The read-only ArrayList myReadOnlyAL contains:" );
foreach ( String myStr in myReadOnlyAL )
Console.WriteLine( " {0}", myStr );
}
}输出：
myAL is writable. myReadOnlyAL is read-only. Initially, The original ArrayList myAL contains: red orange yellow The read-only ArrayList myReadOnlyAL contains: red orange yellow Trying to add a new element to the read-only ArrayList: Exception: System.NotSupportedException: Collection is read-only. at System.Collections.ReadOnlyArrayList.Add(Object obj) at SamplesArrayList.Main() After adding a new element to the original ArrayList, The original ArrayList myAL contains: red orange yellow blue The read-only ArrayList myReadOnlyAL contains: red orange yellow blue