ForEach String concat

java 8 foreach string concatenation
string.concat c#
how to append string in c# with delimiter
foreach concat string javascript
string concat syntax
string.join c#
c# program to concatenate two strings
using string concat in c#

A little newbie question. I have a foreach loop where I am trying to access the property of a row object and assign to a string.

foreach(row in Dataset)
{
 string finalName= row.name;

}

On each iteration I need to concat each row's name property to the finalName

\Thanks alot,

Depending on your performance requirements you can either concat using the addition operator:

string finalName = string.Empty;
foreach(row in Dataset)
{
    finalName += row.name;    
}

or use a StringBuilder:

Stringbuilder sb = new StringBuilder();
foreach(row in Dataset)
{
    sb.Append(row.Name);   
}

string finalName = sb.ToString();

General for very small numbers of appends you won't notice a difference between the two versions. But if you are combining a lot of strings then there may be a very noticeable performance and memory benefit to using the StringBuilder.

Also bear in mind that this will place the strings directly one after the other so you may also wish to append a space or new line between each of them.


Special bonus LINQ one-liner:

Since you seem to be new to C# I'd suggest that you ignore this one since it is quite advanced and frankly not as readable (but on the other hand who doesn't like throwing random bits of LINQ into their code?). Still, I'll add it here for completeness. I don't know what the performance is like, but one major advantage over the other methods is the ease with with you can place a space or other character between the strings. Just change the value in the marked line to whatever value you want to separate the combined strings with (Environment.NewLine or " ", for example)

string finalName = string.Join(
                "", //Change the value here to separate the strings.
                (from row in Dataset
                 select row.Name).ToArray());

or, if you prefer lambdas to LINQ:

string finalName = string.Join(
            "", //Change the value here to separate the strings.
            Dataset.Select(row => row.Name).ToArray());

String concatenation in loop - C# queries, This rule finds code that performs string concatenation in a loop using the + operator. If the enclosing loop in question is executed many times, the use of the +  Concatenates the string representations of four specified read-only character spans. Concat(Object, Object, Object, Object) Concatenates the string representations of four specified objects and any objects specified in an optional variable length parameter list.

Just a couple of things...

  1. DataSet's don't have rows, they have DataTables, and those DataTables have DataRows
  2. You can use the += operator to perform a concatenation, though the general advice is that a StringBuilder object is better suited to this for performance and memory reasons.

Assuming your DataSet has one DataTable and the column you're after is called name, you can use either of these (the first using the += operator, the second using a StringBuilder)

string finalName = string.Empty;

foreach(DataRow row in dataSet.Tables[0].Rows)
{
    finalName += row["name"].ToString();
}

or

System.Text.StringBuilder builder = new System.Text.StringBuilder();

foreach(DataRow row in dataSet.Tables[0].Rows)
{
    builder.Append(row["name"].ToString());
}

string finalName = builder.ToString();

for, for-in, forEach, string concatenation and the ||-operator , for, for-in, forEach, string concatenation and the ||-operator. Hi, I've been experimenting with JavaScript and have a few questions with regards  I am using two for each loops to concatenate values into ONE variable so I can write the value to Word in a Find/Replace method. My issue is that the below syntax will write the values to the Cons

Here's one...

string finalName = ""

foreach (DataRow row in dataSet.TableX)
{
   finalName += row.Name;
   finalName += Environment.NewLine;
}

Here's another...

StringBuilder finalName = new StringBuilder()

foreach (DataRow row in dataSet.TableX)
{
    finalName.Append(row.Name);
    finalName.Append(Environment.NewLine);
}

Should I create an empty string and append through a foreach loop , Strings in C# are immutable which means that this: resouces += string.Format(); will create 2 strings: one from string.Format and then the new  I'm really not familiar with PowerShell, and I did not find a way to concatenate ,xxx. In my case it is essential to do the concatenation within a loop, not with a file operation afterwards. string loops powershell foreach concatenation

If you really just want to concat, then this is all you need...

string finalName = "";

foreach(DataRow row in dataset.Tables[tablename].Rows)
{
 finalName += row.name;

}

C# string.Join Examples, Join method to combine an array of strings into one string with a separator. of the method combines strings with StringBuilder and its Append method. [] arr) { StringBuilder builder = new StringBuilder(); foreach (string s in arr) { builder. Concatenation is the process of appending one string to the end of another string. You concatenate strings by using the + operator. For string literals and string constants, concatenation occurs at compile time; no run-time concatenation occurs. For string variables, concatenation occurs only at run time.

you can add the values into a list and then join the values in the list

List<string> listRows = new List<string>();
    string rowValues = string.Empty;

    foreach(row in DataSet)
    {
        string fileName = row.name;
        listRows.Add(fileName);
    }

    rowValues = string.Join(",", listRows);

https://social.msdn.microsoft.com/Forums/vstudio/e, From Java8 variables need to be effectively final for using them in closures. Following code shows how to concatenate a string from List of  How would I join two strings in Razor syntax? If I had: @Model.address and @Model.city and I wanted the out put to be address city what would I do? Is it as simple as doing @Model.address + " " +

How to concatenate strings in Java forEach loop, foreach ( string elements in strA). {. Console.WriteLine( "Elements of strA array : {​0}" , elements);. } // concatenate the element of array. // into single string. An aggregate is a function that takes a collection of values and returns a scalar value. Examples from T-SQL include min, max, and sum. Both VB and C# have support for aggregates. Both VB and C# support aggregates as extension methods. Using the dot-notation, one simply calls a method on an IEnumerable object.

C# | String Concat with examples, C# String Builder represented by the StringBuilder class in c# is used to concatenate strings in C# and provides string modifications methods  Is there any easy LINQ expression to concatenate my entire List<string> collection items to a single string with a delimiter character? Concat all strings inside

StringBuilder and String Concatenation, Format on Save. If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting. <Extension()> Public Function Concat(Of TSource) (first As IEnumerable(Of TSource), second As IEnumerable(Of TSource)) As IEnumerable(Of TSource) Type Parameters TSource

Comments
  • What language is this for? It appears C#, but it could easily be something else. Do you need to append some kind of delimiter in between the row names, or willitbeareallylongnameinthefinal result?
  • @Dillie-O excellent way of showing why a delimiter might be a good idea, +1
  • I'm pretty sure you don't want "finalName" declared within the foreach.
  • @Chris: He's concatenating data across ROWS, not COLUMNS. Thousands of records in a table is commonplace.
  • @AdamRobinson: oops my bad, I read the question wrong. Yeah, you'll want to use a StringBuilder!