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1. Top results related to string builder c# example list

   • C++ one-line string builder class

     Top Answer

     Answered Apr 19, 2018 · 1 votes

     You don't need a custom StringBuilder class, the STL already has its own built-in class - std::ostringstream

     . It is little tricky to use it in a 1-liner, but it can be done:

     #include <string>#include <sstream>-int i = 1;double d = 3.2;std::string str = static_cast<std::ostringstream&>(std::ostringstream() << "i=" << i << " and d=" << d).str();

     Live Demo

     The static_cast is needed because the standard operator<< returns a std::ostream&, but str() is not a member of std:::ostream, only of std::ostringstream. Since we know the std::ostream& refers to a std::ostringstream object, can can safely cast to it.

     Normally, you would use a variable instead:

     std::ostringstream oss;oss << "i=" << i << " and d=" << d;std::string str = oss.str();-

     But, let's say, for the sake of argument, that you did want to create a custom StringBuilder class. It would simply need to implement operator<<, and a way to get the collected data in std::string format. For example:

     #include <string>#include <sstream>-class StringBuilder{private: // this is just an example, you can use whatever you want // to collect and store the built data inside this class. // However, if you don't use std::ostringstream for the // collection, you may have to overload 'operator<<' for // every data type you want to support for input. This // example uses a single templated override for simplicity... std::ostringstream m_strm;public: template<typename T> StringBuilder& operator<<(const T &arg) { m_strm << arg; return *this; } operator std::string() const { return m_strm.str(); }};

     #include <string>-int i = 1;double d = 3.2;std::string str = StringBuilder() << "i=" << i << " and d=" << d;

     Live Demo

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     1/5

   • C++ Boost Intrusive List - Example

     Top Answer

     Answered Dec 29, 2019 · 4 votes

     You declared class1 after list. So when main exits, class1 is destroyed before list is. (Destruction in reverse order of construction.)

     You have inserted class1 into list. So when list is destroyed, class1, which is still inserted into the container, is not alive anymore.

     Move the declaration of class1 before that of list, so that it will be destroyed later.

     Compare also to the boost documentation from which you probably constructed the code in your question. There the element object is also declared before the list.

     In general the note at the bottom of the linked documentation page is important. It says that the container only stores a reference and that you must make sure that the inserted elements stay alive longer than the container.

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     2/5

   • C++ Class Initialization List example

     Top Answer

     Answered Jun 02, 2013 · 4 votes

     First I think initialization lists are useful when when you are dealing with constant members or when passing objects as parameters since you avoid calling the default constructor then the actual assignement.

     You should write the following code in your cpp file : no need to rewrite the parameters types in the initialization list.

     A::A(std::string s, int i) : _plantName(s), _growTimeMinutes(i){}

     Your h file should be :

     class A{ public: A(std::string, int); private: std::string _plantName; int _growTimeMinutes;};

     And you should create a new A object like that

     A new_object("string", 12);

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     3/5

   • C# list in a list [] .toList()

     Top Answer

     Answered May 26, 2016 · 2 votes

     I think nik0lias suggestion is formerly correct but maybe it can runs as desired if changed to :

     case 1: lblVoornaamVrbl.Text = persGegevens[i][ 0 ].ToString(); break; case 2: lblAchternaamVrbl.Text = persGegevens[i][ 0 ].ToString(); break; case 3: lblGbrtedatumVrbl.Text = persGegevens[i][ 0 ].ToString(); break; case 4: lblFuntieVrbl.Text = persGegevens[i][ 0 ].ToString();

     If I am right, consider if a List array List<>[] is needed or you can simplify your code with List this way:

     string query = "SELECT * FROM gebruiker WHERE id='" + id + "'";- List<string> listGebruiker = new List<string>();- if (this.openConnection() == true) { MySqlCommand cmd = new MySqlCommand(query, connection); //Een nieuw datareader object maken en dan query uitvoeren MySqlDataReader dataReader = cmd.ExecuteReader(); while (dataReader.Read()) { listGebruiker.Add(dataReader["id"].ToString()); listGebruiker.Add(dataReader["voornaam"].ToString()); listGebruiker.Add(dataReader["achternaam"].ToString()); listGebruiker.Add(dataReader["geboortedatum"].ToString()); listGebruiker.Add(dataReader["Rol_id"].ToString()); } dataReader.Close(); this.closeConnection(); return list; }

     and

     DBconnect connectDB = new DBconnect(); List<string> persGegevens = connectDB.persoonlijkeGegevens(userId);- lblVoornaamVrbl.Text = persGegevens[1]; lblAchternaamVrbl.Text = persGegevens[2]; lblGbrtedatumVrbl.Text = persGegevens[3]; lblFuntieVrbl.Text = persGegevens[4];

     Hope this helps

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     4/5

   • C# list contains specific string

     Top Answer

     Answered Mar 06, 2016 · 0 votes

     I'm not sure what your problem is:

     First of all, it seems your first code snippet contains a typo: you have List<string> myListSimplified but then inside the foreach you reference myListSimplifed (missing 'i' after the 'f').

     If I correct that typo and run your code, then I get a list containing {"thing", "else", "other" }, which seems to be what you also expect.

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     5/5

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2. learn.microsoft.com › base-types › stringbuilderUsing the StringBuilder Class in .NET - .NET | Microsoft Learn

   learn.microsoft.com › base-types › stringbuilder

   • Cached

   Sep 15, 2021 · The System.Text.StringBuilder class can be used when you want to modify a string without creating a new object. For example, using the StringBuilder class can boost performance when concatenating many strings together in a loop.

3. People also ask

   How to use StringBuilder in C#?

   • To solve this problem, C# introduced the StringBuilder in the System.Text namespace. The StringBuilder doesn't create a new object in the memory but dynamically expands memory to accommodate the modified string. You can create an object of the StringBuilder class using the new keyword and passing an initial string.

   C# - StringBuilder - TutorialsTeacher.com

   www.tutorialsteacher.com/csharp/csharp-stringbuilder

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   What is a StringBuilder class?

   • The System.Text.StringBuilder class can be used when you want to modify a string without creating a new object. For example, using the StringBuilder class can boost performance when concatenating many strings together in a loop. The StringBuilder class is found in the System.Text namespace.

   Using the StringBuilder Class in .NET - .NET | Microsoft Learn

   learn.microsoft.com/en-us/dotnet/standard/base-types/stringbuilder

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   How does StringBuilder create a new object?

   • The StringBuilder doesn't create a new object in the memory but dynamically expands memory to accommodate the modified string. You can create an object of the StringBuilder class using the new keyword and passing an initial string. The following example demonstrates creating StringBuilder objects.

   C# - StringBuilder - TutorialsTeacher.com

   www.tutorialsteacher.com/csharp/csharp-stringbuilder

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   Is StringBuilder mutable?

   • Console.WriteLine(sb);//output: Hello C#! StringBuilder is mutable. StringBuilder performs faster than string when appending multiple string values. Use StringBuilder when you need to append more than three or four strings. Use the Append() method to add or append strings to the StringBuilder object.

   C# - StringBuilder - TutorialsTeacher.com

   www.tutorialsteacher.com/csharp/csharp-stringbuilder

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4. stackoverflow.com › questions › 4266795c# - Append 'List' items to StringBuilder - Stack Overflow

   stackoverflow.com › questions › 4266795

   I tried to append the items in a List<string> to a StringBuilder with LINQ: items.Select(i => sb.Append(i + ",")); I found a similar question here which explains why the above doesn't work, but I couldn't find an Each of ForEach or anything similar on List which I could use instead.

5. Videos

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     Part 60 C# Tutorial Difference between String and StringBuilder

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     16. C# - StringBuilder

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     19: StringBuilder Class Methods in C# | C# Tutorial For Beginners | C Sharp Tutorial | mmtuts

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6. www.dotnetperls.com › stringbuilderC# StringBuilder Examples - Dot Net Perls

   www.dotnetperls.com › stringbuilder

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   May 11, 2023 · StringBuilder. A C# string can be built one piece at a time, but for strings, each append causes a string copy. With StringBuilder we eliminate this copy. Unlike a string, a StringBuilder can be changed. With it, an algorithm that modifies characters in a loop runs fast—many string copies are avoided. First example.

7. learn.microsoft.com › en-us › dotnetStringBuilder Class (System.Text) | Microsoft Learn

   learn.microsoft.com › en-us › dotnet

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   Examples. The following example shows how to call many of the methods defined by the StringBuilder class. using namespace System; using namespace System::Text; int main() { // Create a StringBuilder that expects to hold 50 characters. // Initialize the StringBuilder with "ABC".

8. www.tutorialsteacher.com › csharp › csharp-stringbuilderC# - StringBuilder - TutorialsTeacher.com

   www.tutorialsteacher.com › csharp › csharp-stringbuilder

   • Cached

   Jun 26, 2020 · This article explains stringbuilder in C#. StringBuilder is a dynamic object that allows you to expand the number of characters in the string. It doesn't create a new object in the memory but dynamically expands memory to accommodate the modified string.

   • Author: Ravi Karia

9. www.geeksforgeeks.org › stringbuilder-in-c-sharpStringBuilder in C# - GeeksforGeeks

   www.geeksforgeeks.org › stringbuilder-in-c-sharp

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   Mar 11, 2019 · To avoid string replacing, appending, removing or inserting new strings in the initial string C# introduce StringBuilder concept. StringBuilder is a dynamic object. It doesn’t create a new object in the memory but dynamically expands the needed memory to accommodate the modified or new string.

10. learn.microsoft.com › system-text-stringbuilderSystem.Text.StringBuilder class - .NET | Microsoft Learn

    learn.microsoft.com › system-text-stringbuilder

    • Cached

    Jan 8, 2024 · The following example illustrates how a StringBuilder object allocates new memory and increases its capacity dynamically as the string assigned to the object expands.