Use ref and out to pass the Array

C # Learning Experience: Using ref and out to pass the Array (downmoon), I hope to share with you
1. Like all out parameters, an out parameter of the array type must be assigned a value first, that is, it must be assigned a value by the receiver. For example:

Public static void mymethod (Out int [] ARR)
{
Arr = new int [10]; // clear Delegate of array arr
}
2. Like all ref parameters, the ref parameter of the array type must be explicitly assigned by the caller. Therefore, it is not necessary for the receiver to explicitly assign values. You can change the ref parameter of the array type to the result of the call. For example, you can assign a null value to an array or initialize it as another array. For example:

Public static void mymethod (ref int [] ARR)
{
Arr = new int [10]; // arr is initialized to a new array.
}
The following two examples illustrate the usage differences between out and ref in passing arrays to methods.

Example 1
In this example, declare the array myarray In the caller (main method) and initialize the array in the fillarray method. Then, the array elements are returned to the caller and displayed.

Using system;
Class testout
{
Static public void fillarray (Out int [] myarray)
{
// Initialize the Array (required ):
Myarray = new int [5] {1, 2, 3, 4, 5 };
}

Static public void main ()
{
Int [] myarray; // initialize the Array (not required !)

// Pass the array to the caller (using the out method:
Fillarray (Out myarray );

// Display array elements
Console. writeline (the array element is :);
For (INT I = 0; I <myarray. length; I ++)
Console. writeline (myarray [I]);
}
}
Output
The array element is:
1
2
3
4
5
Example 2
In this example, initialize the array myarray In the caller (main method) and pass it to the fillarray method by using the ref parameter. Update some array elements in the fillarray method. Then, the array elements are returned to the caller and displayed.

Using system;
Class testref
{
Public static void fillarray (ref int [] ARR)
{
// Create a new array as needed (not required)
If (ARR = NULL)
Arr = new int [10];
// Otherwise, fill in the array.
Arr [0] = 123;
Arr [4] = 1024;
}

Static public void main ()
{
// Initialize the array:
Int [] myarray = {1, 2, 3, 4, 5 };

// Use ref to pass the array:
Fillarray (ref myarray );

// Display the updated array elements:
Console. writeline (the array element is :);
For (INT I = 0; I <myarray. length; I ++)
Console. writeline (myarray [I]);
}
}
Output
The array element is:
123
2
3
4
1024

 

 

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