C# programming: Comparative analysis with foreach loop

Updated: March 26, 2025 09:18:25 Author: AitTech

This article mainly introduces C# programming: a comparison and analysis with foreach loops, which has good reference value. I hope it will be helpful to everyone. If there are any errors or no complete considerations, I hope you will be very encouraged.

Comparison of C# and foreach loops

In C#,List<T>.ForEachMethods and traditionalforeachLoops are all used to iterate over elements in a list and perform operations on each element, but there are some key differences between them.

List<T>.ForEach method

Method signature：public void ForEach(Action<T> action)
type：ForEachyesList<T>An instance method of the class.
Thread safety: Not thread-safe. If the list is modified during the traversal (such as adding or removing elements), an exception may be caused.
Entrustment: It accepts oneAction<T>Delegate, which defines the action to be performed on each element in the list.
Exception handling: If the delegate throws an exception during execution, it will propagate to the callForEachand the traversal stops.

Traditional foreach loop

grammar：foreach (var item in collection)
type：foreachIt is a keyword in C# language, used to traverse itIEnumerable<T>orIEnumerableCollection of interfaces.
Thread safety: Also not thread-safe, but provides more flexibility to handle exceptions and modify collections within the loop body (although this is usually not recommended as it can lead to undefined behavior).
flexibility: Can be used in the circulation bodybreak、continueandreturnStatements to control the flow of the loop.
Exception handling: Exceptions can be caught and processed in the loop body without stopping the entire traversal immediately.

Give an example

using System;
using ;

class Program
{
    static void Main()
    {
        List&lt;int&gt; numbers = new List&lt;int&gt; { 1, 2, 3, 4, 5 };

        // Use Method        (number =&gt;
        {
            (number);
            // Note: break, continue or return cannot be used here to control the loop        });

        // Use traditional foreach loops        foreach (var number in numbers)
        {
            (number);

            // You can use break, continue or return            // if (number == 3) break; // This will jump out of the loop            // if (number == 3) continue; // This will skip the current iteration and continue to the next time            // if (number == 3) return; // This will exit the entire method (if this is inside the method)        }

        // Another example: exception handling        try
        {
            (number =&gt;
            {
                if (number == 3) throw new InvalidOperationException("Number 3 is not allowed.");
                (number);
            });
        }
        catch (Exception ex)
        {
            ("Exception caught in ForEach: " + );
        }

        try
        {
            foreach (var number in numbers)
            {
                if (number == 3)
                {
                    // Exceptions can be caught here, or the exception can be propagated                    // throw new InvalidOperationException("Number 3 is not allowed.");
                    ("Skipping number 3 due to potential issue.");
                    continue; // Choose to skip the number 3 instead of throwing an exception                }
                (number);
            }
        }
        catch (Exception ex)
        {
            ("Exception caught in foreach: " + );
        }
    }
}

In this example,The method concisely traverses the list and performs operations on each element, but it does not allow control of the flow of the loop (such as usingbreak、continueorreturn). TraditionalforeachLoops provide more flexibility, including exception handling and loop control.

Summarize

The above is personal experience. I hope you can give you a reference and I hope you can support me more.

C#
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