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

   • C# Select elements in list as List of string

     Top Answer

     Answered Mar 27, 2012 · 102 votes

     List<string> empnames = emplist.Select(e => e.Ename).ToList();-

     This is an example of Projection in Linq. Followed by a ToList to resolve the IEnumerable<string> into a List<string>.

     Alternatively in Linq syntax (head compiled):

     var empnamesEnum = from emp in emplist select emp.Ename;List<string> empnames = empnamesEnum.ToList();

     Projection is basically representing the current type of the enumerable as a new type. You can project to anonymous types, another known type by calling constructors etc, or an enumerable of one of the properties (as in your case).

     For example, you can project an enumerable of Employee to an enumerable of Tuple<int, string> like so:

     var tuples = emplist.Select(e => new Tuple<int, string>(e.EID, e.Ename));

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     1/5

   • C# how can I loop through all Elements of a List

     Top Answer

     Answered Dec 22, 2019 · 1 votes

     I suppose that you want something like this.

     // Store your relevant keywords in a list of stringsList<string> datatypes = new List<string>{"string", "int"};-// Now loop over the ValueList using a normal for loop// starting from the second elemend and skipping the nextfor(int x = 1; x < ValueList.Count; x+=2){ // Get the current element in the ValueList string current = ValueList[x]; // Verify if it is present in the identifiers list if (datatypes.Contains(current))) { // Yes, then add the element before the current and the current to the MyObject list MyObject obj = new MyObject; obj.name = ValueList[x - 1]; obj.type = current; listObjects.Add(obj); }}

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     2/5

   • C++ adding elements of list of pairs

     Top Answer

     Answered Jul 21, 2015 · 7 votes

     In this call of the algorithm

     cout<<accumulate(v.begin(),v.end(),0,[](auto &a, auto &b){return a.first+b.first;});-

     its third parameter is initialized by 0 and hence has deduced type int.

     It corresponds to the accumulator of the algorithm that accumulates the values that are suplied by the second parameter of the lambda expression.

     So you have to write

     cout<<accumulate(v.begin(),v.end(),0,[](auto &a, auto &b){return a + b.first;});

     As for me I would initialize it with integer literal of type long long int. For example

     cout<<accumulate(v.begin(),v.end(),0ll,[](auto &a, auto &b){return a +b.first;});

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     3/5

   • C# How to best add elements of string array to generic List

     Top Answer

     Answered Mar 27, 2015 · 7 votes

     Use the constructor that takes an IEnumerable:

     List<string> strList = new List<string>(strArr);-

     or call ToList() on your array:

     List<string> strList = strArr.ToList();

     which is probably the most common way to do it.

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     4/5

   • C++ list, get number of elements in a list?

     Top Answer

     Answered Mar 24, 2013 · 6 votes

     §23.3.6 says:

     The member function size() returns the number of elements in the container.

     This means that

     • 1) you have a broken C++ environment, or
     • 2) you have, somehow, added more elements to your list.

     Unfortunately, it's hard to tell which is the case, as you haven't posted enough information. What would be nice is a small, complete, examples that demonstrates what you are trying to do, a description of what happens and what you expected to happen.

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     5/5

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2. 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.

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

   learn.microsoft.com › base-types › stringbuilder

   • Cached

   • Overview
   • Importing the System.Text Namespace
   • Instantiating a StringBuilder Object
   • Setting the Capacity and Length
   • Converting a StringBuilder Object to a String
   • See also

   The String object is immutable. Every time you use one of the methods in the System.String class, you create a new string object in memory, which requires a new allocation of space for that new object. In situations where you need to perform repeated modifications to a string, the overhead associated with creating a new String object can be costly....

   See full list on learn.microsoft.com

   The StringBuilder class is found in the System.Text namespace. To avoid having to provide a fully qualified type name in your code, you can import the System.Text namespace: using System; using System.Text;

   See full list on learn.microsoft.com

   You can create a new instance of the StringBuilder class by initializing your variable with one of the overloaded constructor methods, as illustrated in the following example. StringBuilder myStringBuilder = new StringBuilder("Hello World!");

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   Although the StringBuilder is a dynamic object that allows you to expand the number of characters in the string that it encapsulates, you can specify a value for the maximum number of characters that it can hold. This value is called the capacity of the object and should not be confused with the length of the string that the current StringBuilder holds. For example, you might create a new instance of the StringBuilder class with the string "Hello", which has a length of 5, and you might specify that the object has a maximum capacity of 25. When you modify the StringBuilder, it does not reallocate size for itself until the capacity is reached. When this occurs, the new space is allocated automatically and the capacity is doubled. You can specify the capacity of the StringBuilder class using one of the overloaded constructors. The following example specifies that the myStringBuilder object can be expanded to a maximum of 25 spaces. StringBuilder myStringBuilder = new StringBuilder("Hello World!", 25); Additionally, you can use the read/write Capacity property to set the maximum length of your object. The following example uses the Capacity property to define the maximum object length. myStringBuilder.Capacity = 25; The EnsureCapacity method can be used to check the capacity of the current StringBuilder. If the capacity is greater than the passed value, no change is made; however, if the capacity is smaller than the passed value, the current capacity is changed to match the passed value.

   The Length property can also be viewed or set. If you set the Length property to a value that is greater than the Capacity property, the Capacity property is automatically changed to the same value as the Length property. Setting the Length property to a value that is less than the length of the string within the current StringBuilder shortens the string.

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   You must convert the StringBuilder object to a String object before you can pass the string represented by the StringBuilder object to a method that has a String parameter or display it in the user interface. You do this conversion by calling the StringBuilder.ToString method. The following example calls a number of StringBuilder methods and then c...

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   •System.Text.StringBuilder

   •Basic String Operations

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4. stackoverflow.com › questions › 5012754Building a string from List<string> in C# - Stack Overflow

   stackoverflow.com › questions › 5012754

   Feb 16, 2011 · If you're not on .NET 4.0 but you don't want the overhead of the ToArray call, you could write a method to create a StringBuilder, append every item in the List<string> plus your delimiter (skipping the delimiter after the last item), and return the result of ToString at the end.

5. andrewlock.net › a-deep-dive-on-stringbuilder-partAppending strings, built-in types, and lists - Andrew Lock

   andrewlock.net › a-deep-dive-on-stringbuilder-part

   Jul 20, 2021 · In this post I look at how StringBuilder appends strings, ints, and doubles efficiently. We also look at how it adds lists with a separator.

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

   www.dotnetperls.com › stringbuilder

   • Cached

   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

   • Cached

   Concatenates the string representations of the elements in the provided array of objects, using the specified separator between each member, then appends the result to the current instance of the string builder.

8. People also ask

   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

   See all results for this question

   How does StringBuilder work?

   • 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.

   C# StringBuilder Examples - Dot Net Perls

   www.dotnetperls.com/stringbuilder

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   What are the different types of StringBuilder?

   • In this post we look at appending three different types: string s, built in types (like int and double ), and lists (with a separator) In the previous post, I showed how a single char and a single repeated char are added to the StringBuilder.

   Appending strings, built-in types, and lists - Andrew Lock

   andrewlock.net/a-deep-dive-on-stringbuilder-part-2-appending-strings-built-in-types-and-lists/

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   How do I create a StringBuilder?

   • If you're not on .NET 4.0 but you don't want the overhead of the ToArray call, you could write a method to create a StringBuilder, append every item in the List plus your delimiter (skipping the delimiter after the last item), and return the result of ToString at the end.

   Building a string from List<string> in C# - Stack Overflow

   stackoverflow.com/questions/5012754/building-a-string-from-liststring-in-c-sharp

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

   www.tutorialsteacher.com › csharp › csharp-stringbuilder

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   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.