C# |数组。清除()方法
原文:https://www.geeksforgeeks.org/c-sharp-array-clear-method/
此方法用于将数组中的元素范围设置为每个元素类型的默认值。
语法:
public static void Clear (Array array, int index, int length);
参数:
数组:是需要清除元素的数组。 指数:它是元素清除范围的起始指数。 长度:是需要清除的元素数量。
异常:
- ArgumentNullException: 如果数组为空
- indexout of range exception:如果索引小于数组 或的下限，则长度小于零或索引和长度之和大于数组的大小。
下面是举例说明数组。Clear() 方法:
例 1:
// C# program to demonstrate Array.Clear()
// method for int type value
using System;
using System.Collections.Generic;
public class GFG {
// Main Method
public static void Main()
{
// Creating and initializing new the String
int[] myArr = {10, 20, 30, 40};
// Display the values of the myArr.
Console.WriteLine("Array Before Operation:");
// calling the PrintIndexAndValues() method
PrintIndexAndValues(myArr);
Console.WriteLine();
Array.Clear(myArr, 1, 2);
// Display the values of myArr
Console.WriteLine("Array After Operation:");
// calling the PrintIndexAndValues() method
PrintIndexAndValues(myArr);
}
// Defining the method PrintIndexAndValues
public static void PrintIndexAndValues(int[] myArr)
{
for (int i = 0; i < myArr.Length; i++) {
Console.WriteLine("{0}", myArr[i]);
}
}
}
Output:
Array Before Operation:
10
20
30
40
Array After Operation:
10
0
0
40
示例 2: 适用于参数异常
// C# program to demonstrate
// Array.Clear() method
// for ArgumentNullException
using System;
using System.Collections.Generic;
public class GFG {
public static void Main()
{
try {
// Creating and initializing
// new the Int with null
int[] myArr = null;
// Clearing the myArr
// using Clear() method
Console.WriteLine("Try to clear the element from null Array:");
Array.Clear(myArr, 1, 2);
// Display the values of myArr
Console.WriteLine("Array after operation :");
// calling the PrintIndexAndValues() method
PrintIndexAndValues(myArr);
}
catch (ArgumentNullException e) {
Console.WriteLine();
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (IndexOutOfRangeException e) {
Console.WriteLine();
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining the method PrintIndexAndValues
public static void PrintIndexAndValues(int[] myArr)
{
for (int i = 0; i < myArr.Length; i++) {
Console.WriteLine("{0}", myArr[i]);
}
}
}
Output:
Try to clear the element from null Array:
Exception Thrown: System.ArgumentNullException
示例 3: 适用于 IndexOutOfRangeException
// C# program to demonstrate
// Array.Clear() method
// for IndexOutOfRangeException
using System;
using System.Collections.Generic;
public class GFG {
// Main Method
public static void Main()
{
try {
// Creating and initializing new Int array
int[] myArr = {10, 20, 30, 40};
// Display the values of myArr
Console.WriteLine("Array Before Operation:");
// calling the PrintIndexAndValues() method
PrintIndexAndValues(myArr);
Console.WriteLine();
// Clearing the myArr
// using Clear() method
Console.WriteLine("Taking index out of bound:");
Array.Clear(myArr, -1, 2);
// Display the values of myArr
Console.WriteLine("Array After Operation:");
// calling the PrintIndexAndValues() method
PrintIndexAndValues(myArr);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown :");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (IndexOutOfRangeException e) {
Console.Write("Exception Thrown :");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining the method PrintIndexAndValues
public static void PrintIndexAndValues(int[] myArr)
{
for (int i = 0; i < myArr.Length; i++) {
Console.WriteLine("{0}", myArr[i]);
}
}
}
Output:
Array Before Operation:
10
20
30
40
Taking index out of bound:
Exception Thrown :System.IndexOutOfRangeException
参考:
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