C# |数组。约束复制()方法

原文:https://www . geeksforgeeks . org/c-sharp-array-constrained copy-method/

此方法用于从指定的源索引开始复制数组中的一系列元素，并将它们粘贴到从指定的目标索引开始的另一个数组中。保证如果复制没有完全成功，所有更改都将被撤消。

语法:

public static void ConstrainedCopy (Array sourceArray, int sourceIndex, 
Array destinationArray, int destinationIndex, int length);

参数:

源数组:是包含要复制的数据的数组。源索引:它是代表源数组中开始复制的索引的 32 位整数。目的阵列:接收数据的是阵列。目标索引:是代表目标数组中开始存储的索引的 32 位整数。长度:表示要复制的元素数量的 32 位整数。

异常:

ArgumentNullException: 如果 sourceArray 或 destinationArray 为空。
rankeexception:如果 sourceArray 和 destinationArray 的等级不同。
ArrayTypeMismatchException:如果 sourceArray 类型与 destinationArray 类型既不相同也不从 destination array 类型派生。
InvalidCastException:source array 中至少有一个元素不能转换为 destinationArray 的类型。
ArgumentOutOfRangeException:如果 sourceIndex 小于 sourceArray 第一维度的下界或 destinationIndex 小于 destinationArray 第一维度的下界或长度小于零。
参数异常:如果长度大于从源索引到源数组末尾的元素数或长度大于从目标索引到目标数组末尾的元素数。

下面的程序说明了数组的使用。ConstrainedCopy(Array，Int32，Array，Int32，Int32)方法:

例 1:

// C# program to demonstrate
// ConstrainedCopy() method
using System;
using System.Collections.Generic;

public class GFG {

    // Main Method
    public static void Main()
    {

        try {

            // Creating and initializing new the String
            String[] srcArr = { "Sun", "Mon", "Tue", "Thu" };

            // Creating the object of empty String Array
            String[] destArr = new String[10];

            // Display the values of the myArr.
            Console.WriteLine("Initial Array:");

            // calling the PrintIndexAndValues()
            // method to print
            PrintIndexAndValues(srcArr);

            // getting a ConstrainedCopy in destArr
            // from srcArr using method ConstrainedCopy()
            Array.ConstrainedCopy(srcArr, 1, destArr, 0, 3);

            // Display the value of the destArr
            Console.WriteLine("Destination Array: ");

            // calling the PrintIndexAndValues()
            // method to print
            PrintIndexAndValues(destArr);
        }
        catch (ArgumentNullException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (RankException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArrayTypeMismatchException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (InvalidCastException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentOutOfRangeException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }

    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(String[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {

            Console.WriteLine("{0}", myArr[i]);
        }
        Console.WriteLine();
    }
}

Output:

Initial Array:
Sun
Mon
Tue
Thu

Destination Array: 
Mon
Tue
Thu

示例 2: 适用于参数异常

// C# program to demonstrate
// ConstrainedCopy() method
// For ArgumentNullException
using System;
using System.Collections.Generic;

class GFG {

// Main Method
public static void Main()
{

    try {

        // Creating and initializing the
        // String Array with null
        String[] srcArr = null;

        // Creating the object of empty String Array
        String[] destArr = new String[10];

        // getting a ConstrainedCopy in destArr
        // from srcArr using method ConstrainedCopy()
        Console.WriteLine("Trying to get the ConstrainedCopy "
                                     +"while srcArr is null");
        Console.WriteLine();
        Array.ConstrainedCopy(srcArr, 1, destArr, 0, 3);

        // Display the value of the destArr.
        Console.WriteLine("Destination Array: ");

        // calling the PrintIndexAndValues()
        // method to print
        PrintIndexAndValues(destArr);
    }
    catch (ArgumentNullException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (RankException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArrayTypeMismatchException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (InvalidCastException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArgumentOutOfRangeException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArgumentException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}

    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(String[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {

            Console.WriteLine("{0}", myArr[i]);
        }
        Console.WriteLine();
    }
}

Output:

Trying to get the ConstrainedCopy while srcArr is null

Exception Thrown: System.ArgumentNullException

例 3: 为rankeexception

// C# program to demonstrate
// ConstrainedCopy() method
// For RankException
using System;
using System.Collections.Generic;

public class GFG {

// Main Method
public static void Main()
{

    try {

        // Creating and initializing new the String
        String[] srcArr = { "Sun", "Mon", "Tue", "Thu" };

        // Creating the object of empty String Array
        String[, ] destArr = new String[10, 5];

        // Display the values of the myArr.
        Console.WriteLine("Initial Array:");

        // calling the PrintIndexAndValues()
        // method to print
        PrintIndexAndValues(srcArr);

        // getting a ConstrainedCopy in destArr
        // from srcArr using method ConstrainedCopy()
        Console.WriteLine("Trying to get the ConstrainedCopy "
                                     +"in destArr of rank 2");
        Console.WriteLine("while rank of srcArr is 1");
        Array.ConstrainedCopy(srcArr, 1, destArr, 0, 3);
    }
    catch (ArgumentNullException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (RankException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArrayTypeMismatchException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (InvalidCastException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArgumentOutOfRangeException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArgumentException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}

// Defining the method
// PrintIndexAndValues
public static void PrintIndexAndValues(String[] myArr)
{
    for (int i = 0; i < myArr.Length; i++) {

        Console.WriteLine("{0}", myArr[i]);
    }
    Console.WriteLine();
}
}

Output:

Initial Array:
Sun
Mon
Tue
Thu

Trying to get the ConstrainedCopy in destArr of rank 2
while rank of srcArr is 1
Exception Thrown: System.RankException

例 4: 为数组类型不匹配异常

// C# program to demonstrate
// ConstrainedCopy() method
// For ArrayTypeMismatchException
using System;
using System.Collections.Generic;

class GFG {

// Main Method
public static void Main()
{

    try {

        // Creating and initializing new the String
        String[] srcArr = { "Sun", "Mon", "Tue", "Thu" };

        // Creating the object of
        // empty Integer Array
        int[] destArr = new int[10];

        // Display the values of the myArr.
        Console.WriteLine("Initial Array:");

        // calling the PrintIndexAndValues()
        // method to print
        PrintIndexAndValues(srcArr);

        // getting a ConstrainedCopy in destArr
        // from srcArr using method ConstrainedCopy()
        Console.WriteLine("Trying to get the "
          +"ConstrainedCopy in destArr of type int");
        Console.WriteLine("but srcArr is of type String");
        Array.ConstrainedCopy(srcArr, 1, destArr, 0, 3);
    }
    catch (ArgumentNullException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (RankException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArrayTypeMismatchException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (InvalidCastException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArgumentOutOfRangeException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArgumentException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}

// Defining the method
// PrintIndexAndValues
public static void PrintIndexAndValues(String[] myArr)
{
    for (int i = 0; i < myArr.Length; i++) {

        Console.WriteLine("{0}", myArr[i]);
    }
    Console.WriteLine();
}
}

Output:

Initial Array:
Sun
Mon
Tue
Thu

Trying to get the ConstrainedCopy in destArr of type int
but srcArr is of type String
Exception Thrown: System.ArrayTypeMismatchException

例 5: 为argumentout of range exception

// C# program to demonstrate 
// ConstrainedCopy() method 
// For ArgumentOutOfRangeException
using System; 
using System.Collections.Generic; 

public class GFG { 

// Main Method 
public static void Main() 
{ 

  try { 

    // Creating and initializing 
    // new the String 
    String[] srcArr = {"Sun", "Mon", "Tue", "Thu"}; 

    // Creating the object of empty String Array 
    String[] destArr = new String[10]; 

    // Display the values of the myArr. 
    Console.WriteLine("Initial Array:"); 

    // calling the PrintIndexAndValues()  
    // method to print 
    PrintIndexAndValues(srcArr); 

    // getting a ConstrainedCopy
    // in destArr from srcArr 
    // using method ConstrainedCopy() 
    Console.WriteLine("Trying to get the ConstrainedCopy"
                          +" of length less than zero");
    Array.ConstrainedCopy (srcArr,1,destArr ,0,-1);

  }
  catch (ArgumentNullException e) { 

        Console.Write("Exception Thrown: "); 
        Console.Write("{0}", e.GetType(), e.Message); 
    } 
  catch (RankException e) { 

        Console.Write("Exception Thrown: "); 
        Console.Write("{0}", e.GetType(), e.Message); 
    } 
  catch (ArrayTypeMismatchException e) { 

        Console.Write("Exception Thrown: "); 
        Console.Write("{0}", e.GetType(), e.Message); 
    } 
  catch (InvalidCastException e) { 

        Console.Write("Exception Thrown: "); 
        Console.Write("{0}", e.GetType(), e.Message); 
    } 
  catch (ArgumentOutOfRangeException e) { 

        Console.Write("Exception Thrown: "); 
        Console.Write("{0}", e.GetType(), e.Message); 
    } 
  catch (ArgumentException e) { 

        Console.Write("Exception Thrown: "); 
        Console.Write("{0}", e.GetType(), e.Message); 
    } 
} 

// Defining the method  
// PrintIndexAndValues 
public static void PrintIndexAndValues(String[] myArr) 
{ 
    for (int i = 0; i < myArr.Length; i++) { 

        Console.WriteLine("{0}", myArr[i]); 
    } 
    Console.WriteLine(); 
} 
}

Output:

Initial Array:
Sun
Mon
Tue
Thu

Trying to get the ConstrainedCopy of length less than zero
Exception Thrown: System.ArgumentOutOfRangeException

示例 6: 适用于参数异常

// C# program to demonstrate
// ConstrainedCopy() method
// For ArgumentException
using System;
using System.Collections.Generic;

public class GFG {

// Main Method
public static void Main()
{

    try {

        // Creating and initializing new the String
        String[] srcArr = { "Sun", "Mon", "Tue", "Thu" };

        // Creating the object of empty String Array
        String[] destArr = new String[10];

        // Display the values of the myArr.
        Console.WriteLine("Initial Array:");

        // calling the PrintIndexAndValues()
        // method to print
        PrintIndexAndValues(srcArr);

        // getting a ConstrainedCopy 
        // in destArr from srcArr
        // using method ConstrainedCopy()
        Console.WriteLine("Trying to get the ConstrainedCopy"
                  +" of length is greater than the number ");
        Console.WriteLine("of elements from sourceIndex"
                    +" to the end of sourceArray.");
        Console.WriteLine();
        Array.ConstrainedCopy(srcArr, 1, destArr, 0, 4);
    }
    catch (ArgumentNullException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (RankException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArrayTypeMismatchException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (InvalidCastException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArgumentOutOfRangeException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
    catch (ArgumentException e) {

        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}

// Defining the method
// PrintIndexAndValues
public static void PrintIndexAndValues(String[] myArr)
{
    for (int i = 0; i < myArr.Length; i++) {

        Console.WriteLine("{0}", myArr[i]);
    }
    Console.WriteLine();
}
}

Output:

Initial Array:
Sun
Mon
Tue
Thu

Trying to get the ConstrainedCopy of length is greater than the number 
of elements from sourceIndex to the end of sourceArray.

Exception Thrown: System.ArgumentException

参考:

https://docs . Microsoft . com/en-us/dotnet/API/system . array . constrained copy？视图=netframework-4.7.2

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