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How to write to a text file in C#?

There are three common methods to write content to a text file in C#. 1. Use File.WriteAllText to write strings at one time, which is suitable for simple scenarios and will overwrite the original file; 2. Use StreamWriter to write step by step, supporting multiple lines and append operations, which is suitable for controlling the writing process; 3. Use File.WriteAllLines to write string arrays or lists, and each element is one line, and the content of the original file is also overwritten. Notes include ensuring that paths are valid, handling permissions and coding issues, and recommending exception capture to improve code robustness.

Aug 04, 2025 am 04:34 AM

Implementing Design Patterns in C# Applications

Design patterns are used in C# to solve common structural problems, improve code maintainability and reduce coupling. 1. Singleton mode is suitable for globally unique instances, such as loggers; 2. Factory mode is used to hide complex creation logic, such as dynamic creation of data sources; 3. Observer mode is suitable for event-driven scenarios, such as UI updates. When using it, you should determine whether there is duplicate code, whether it is volatile in the future, and whether the team is familiar with it. Avoid over-design. It is recommended to gradually evolve from simple packaging.

Aug 04, 2025 am 03:21 AM

Design Patterns c#

What are global using directives in C# 10?

GlobalusingdirectivesinC#10allowyoutodeclareusingstatementsonceattheprojectlevel,applyingthemacrossallfilestoreducerepetition.1.TheymatterbecausepriortoC#10,each.csfilerequireditsownusingdirectivesevenwhenidentical.2.Tousethem,addtheglobalmodifierbef

Aug 03, 2025 am 10:32 AM

C# StringBuilder vs string concatenation performance

StringBuilder is better when splicing strings frequently, while string is more intuitive and convenient when splicing a small amount or simple scenarios. 1. The string in C# is an immutable type. Each splicing will create a new object and copy the content, which has obvious performance losses, especially when looping or large splicing; 2. StringBuilder uses variable character arrays to avoid frequent memory allocation and copying, and is more efficient; 3. For scenarios with fewer splicing times and simple structure, such as splicing several variables or writing log statements, it is more concise and intuitive to use string directly; 4. When using StringBuilder, pre-allocate capacity, reduce ToString() calls, pay attention to thread safety issues, and use A

Aug 03, 2025 am 09:48 AM

C# First() vs FirstOrDefault(): what is the difference?

The core difference between First() and FirstOrDefault() is the behavior when the element cannot be found. 1. First() will throw an InvalidOperationException exception when the element cannot be found, which is suitable for scenarios where the set is not empty or needs to be handled actively; 2. FirstOrDefault() returns the default value when the element cannot be found (reference type is null, value type is 0, false, etc.), which is suitable for scenarios where there is uncertainty whether there is a match and I hope to avoid exceptions; 3. The selection basis depends on the tolerance of the business logic to "no matching result". If the result is expected, first() is used, otherwise FirstOrDefa is used.

Aug 03, 2025 am 07:08 AM

What are delegates in C#?

AdelegateinC#isatypethatdefinesamethodsignatureandallowsmethodsmatchingthatsignaturetobepassedasparametersorstoredinvariables.1.Delegatesaredeclaredwithaspecificreturntypeandparameters,suchaspublicdelegatevoidMyDelegate(stringmessage);.2.Youcanassign

Aug 03, 2025 am 03:40 AM

When to Use C# Structs vs Classes

Whether to use struct or class depends on the data characteristics and usage scenarios. 1. Use struct when the data is small and unchanged or changes are small, such as coordinates and date ranges; 2. Use class when it needs to be frequently modified or shared states in multiple places; 3. When the performance is sensitive and the instance is short-lived, struct is given priority to reduce GC pressure, but frequent copying of large data volumes will affect performance; 4. struct cannot be null by default, avoiding null reference exceptions, and class supports null, which is suitable for scenarios where "no value" state is required; 5. When inheritance or polymorphism, you can only choose class. In short, struct is suitable for lightweight value types, and class is suitable for complex object models.

Aug 02, 2025 pm 02:44 PM

c# Structs

C# struct vs class performance comparison

structs are not necessarily faster, performance depends on the scenario. struct is the value type, assignment copy the entire structure, class is the reference type, assignment copy only the reference. The struct is usually allocated on the stack, and the fast but frequent passing of large structures will increase the replication overhead, and the class allocation involves GC pressure on the heap. Small structs are suitable for high-performance and cache-friendly scenarios, and large structs should be avoided or passed with ref/in. The compact memory of the struct array is conducive to caching, and the class array references are scattered to affect efficiency. Scenarios where struct are preferred: small data, short life cycle, no inheritance or virtual methods are required. Avoid using struct scenarios: large structure, complex logic, polymorphic, frequent packing, and sharing

Aug 02, 2025 am 11:56 AM

How to read a text file line by line in C#?

There are two common ways to read text files line by line in C#: using StreamReader and File.ReadLines(). 1. The ReadLine() method of StreamReader is suitable for processing large files, read line by line through loop and is memory friendly, and uses using to ensure resource release; 2. File.ReadLines() provides concise code, suitable for scenarios that only need to be traversed once, supports lazy loading and can specify encoding. If you need to access the file content multiple times, File.ReadAllLines() is recommended. The two automatically recognize encoding by default, but to avoid garbled code, it is recommended to explicitly specify Encoding.UTF8 and Enc as needed.

Aug 02, 2025 am 06:52 AM

Managing Memory Leaks and Garbage Collection in C#

Memory leaks do exist and have a profound impact in C#, especially for long-term applications. Common signals include continuous memory rise and frequent GC but no obvious release. They can be analyzed and confirmed by tools such as VisualStudio and dotMemory. The main reasons and solutions are as follows: 1. Forgot to cancel the event subscription, you should manually cancel or use weak references; 2. The static collection is not cleaned, and the entry needs to be removed regularly or use WeakReference; 3. Unmanaged resources are not released, IDisposable should be implemented and using using statements. In addition, understanding the generational GC mechanism and optimizing memory usage such as reducing temporary object creation, rational use of structures, and avoiding LOH fragmentation can also help improve performance. Master this

Aug 02, 2025 am 04:24 AM

Garbage collection memory leak

How to format a number as a currency string in C#?

ToformatanumberascurrencyinC#,useToString("C")forbasicformatting,whichappliesthecorrectsymbolandseparatorsbasedoncurrentculture.1.Forconsistentresultsacrossenvironments,specifyacultureusingCultureInfo.2.Tofullycustomizetheformat,suchaschang

Aug 01, 2025 am 05:39 AM

How to call a base class constructor in C#?

To call the base constructor in C#, you need to use the base keyword. When the derived class does not explicitly call the base class constructor, the compiler will try to call the base class's parameterless constructor; if the base class does not have a parameterless constructor, it must be explicitly called in the form: base(...) and pass in the corresponding parameters. 1. If the base class has multiple constructors, choose which one is called according to the parameters passed to base; 2. The base class constructor is usually used to initialize the basic state of the object. If not called, the data may not be initialized correctly; 3. The derived class constructor must ensure that the base class constructor is called correctly, otherwise an error will be reported; 4. Base can also be used to call base class methods and properties, but it can only be used in the initializer in the constructor.

Aug 01, 2025 am 04:20 AM

Choosing the Right C# Collection Type for Performance

Choosing the right collection type can significantly improve C# program performance. 1. Frequently insert or delete the LinkedList in the middle, 2. Quickly search using HashSet or Dictionary, 3. Fixed element count to use arrays first, 4. Select HashSet when unique values are required, 5. Frequently searching using Dictionary or SortedDictionary, 6. Consider ConcurrentBag or ConcurrentDictionary in multi-threaded environment.

Aug 01, 2025 am 03:47 AM

What are C# 8 nullable reference types and how to enable them?

C#8 reduces null reference exceptions by introducing nullable reference types. 1. Can be enabled globally in the project file, 2. Can also be enabled using the #nullable directive in a single file, 3. or through compiler parameters. After enabled, the reference type is not empty by default. It needs to be added explicitly to allow it to be empty. When handling warnings, the actual null value problem should be fixed first, and null value checks should be performed using the null-forgiving operator or pattern matching.

Aug 01, 2025 am 12:26 AM

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How to write to a text file in C#?

Implementing Design Patterns in C# Applications

What are global using directives in C# 10?

C# StringBuilder vs string concatenation performance

C# First() vs FirstOrDefault(): what is the difference?

What are delegates in C#?

When to Use C# Structs vs Classes

C# struct vs class performance comparison

How to read a text file line by line in C#?

Managing Memory Leaks and Garbage Collection in C#

How to format a number as a currency string in C#?

How to call a base class constructor in C#?

Choosing the Right C# Collection Type for Performance

What are C# 8 nullable reference types and how to enable them?

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