Any possibility to fine tuning below code...

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1.00/5 (2 votes)

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C#

  1  private void ShowDataTableInMessageBox()
  2  {
  3      DataTable dataTable = new DataTable();
  4      // Assuming your DataTable has been populated with data, the following is sample data
  5      dataTable.Columns.Add("Id", typeof(int));
  6      dataTable.Columns.Add("Name", typeof(string));
  7      dataTable.Rows.Add(1, "Alice");
  8      dataTable.Rows.Add(2, "Bob");
  9  
 10      StringBuilder sb = new StringBuilder();
 11  
 12      // Traverse the DataTable and add data to the StringBuilder
 13      foreach (DataRow row in dataTable.Rows)
 14      {
 15          foreach (DataColumn column in dataTable.Columns)
 16          {
 17              sb.Append(column.ColumnName + ": " + row[column] + " ");
 18          }
 19          sb.AppendLine(); // Add a new row so each record appears on its own line
 20      }
 21  
 22      // Show message box
 23      MessageBox.Show(sb.ToString(), "DataTable Values");
 24  }
 25  
 26  private void ShowDictionaryInMessageBox()
 27  {
 28      // Assume this is your dictionary
 29      Dictionary<int, string=""> myDictionary = new Dictionary<int, string="">
 30      {
 31          { 1, "Apple" },
 32          { 2, "Banana" },
 33          { 3, "Cherry" }
 34      };
 35  
 36      StringBuilder sb = new StringBuilder();
 37  
 38      // Iterate through the dictionary and add key-value pairs to StringBuilder
 39      foreach (KeyValuePair<int, string=""> kvp in myDictionary)
 40      {
 41          sb.AppendLine($"Key: {kvp.Key}, Value: {kvp.Value}");
 42      }
 43  
 44      // Show message box
 45      MessageBox.Show(sb.ToString(), "Dictionary Values");
 46  }
 47  
 48  private void ShowObjectArrayInMessageBox()
 49  {
 50      // Let's say this is your 2D array of objects
 51      object[][] data = new object[][]
 52      {
 53          new object[] { "Id", 1 },
 54          new object[] { "Name", "Alice" },
 55          new object[] { "Age", 30 },
 56          // new data
 57          new object[] { "City", "New York" },
 58          new object[] { "Occupation", "Engineer" },
 59          new object[] { "Hobby", "Reading" },
 60  
 61          // New data row with "Id"
 62          new object[] { "Id", 2, "Name", "Bob", "Age", 28 },
 63          new object[] { "Id", 3, "Name", "Charlie", "Age", 35 }
 64      };
 65  
 66      StringBuilder sb = new StringBuilder();
 67  
 68      // Traverse the two-dimensional object array and add data to StringBuilder
 69      foreach (object[] row in data)
 70      {
 71          // Each row represents a row, and each object in the row represents a column value of the row.
 72          foreach (object columnValue in row)
 73          {
 74              sb.Append(columnValue.ToString() + " ");
 75          }
 76          sb.AppendLine(); // Add a new row so each record appears on its own line
 77      }
 78  
 79      // Show message box
 80      MessageBox.Show(sb.ToString(), "Object Array Values");
 81  }

What I have tried:

first time tried as above, and would like to fine tune it.

Posted 28-Mar-24 4:48am

Barry Liu from Taipei

Updated 28-Mar-24 4:59am

Richard Deeming

v2

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Richard Deeming 28-Mar-24 10:59am

Explain what you mean by "fine tune it".

Dave Kreskowiak 28-Mar-24 13:18pm

That all depends on what you mean by "fine tune". I don't see much to do to this code because it doesn't do anything really useful.

My biggest complaint is each of these methods does TWO things instead of one. Showing a message box should be up to other UI code, not these methods. These methods should only build a string message and return it.

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Thomas Schröter · Answer 1 · 2024-04-09T22:41:00

@George:

sorry, but StringBuilder IS the PREFERRED way to create strings from data objects. String concatenation is bad due multiple allocating multiple objects in the heap and copying values around. StringBuilder pre allocates a buffer and operations write to this.

Memory Overhead: In C#, strings are immutable, meaning every time you concatenate two strings, a new string object is created in memory. If you're concatenating a large number of strings in a loop or repeatedly in your code, you may end up allocating a significant amount of memory unnecessarily.

Performance: String concatenation can be inefficient, especially when done repeatedly. Each concatenation operation involves creating a new string object and copying the contents of the original strings into the new string. This can result in poor performance, particularly in tight loops or high-throughput sections of your code.

Garbage Collection Overhead: String concatenation can generate a lot of temporary objects, which increases the workload for the garbage collector. Excessive garbage collection can lead to performance degradation and even cause your application to freeze or stutter.

Readability and Maintainability: Excessive string concatenation can make your code harder to read and maintain, especially if you're dealing with complex concatenations involving multiple variables or conditions.

To mitigate these issues, consider using StringBuilder for intensive string manipulations. StringBuilder is optimized for building strings efficiently because it allows you to modify a mutable buffer rather than creating new string objects. Additionally, use string interpolation ($"" syntax) or String.Join() method when concatenating a fixed number of strings or when readability is a concern.

In OOP you should not use anonymous arrays or objects but classes (types) to represent your data. Ok, if you read from data sources like SQL, files, (web) APIs a.s.o. you will get a data stream. Map this data to your own classes that will represent the data objects. e.g. :

C#

class Person
{
    public int    Id        {get; set;} = 0;
    public string Firstname {get; set;} = string.Empty;
    public int    Age       {get; set;} = 0;

    etc...

    override public string ToString ()
    {
        var sb = new StringBuilder ();
        sb.Append ("Name: ");
        sb.Append (Firstname);
        sb.Append (" ");
        sb.Append (Lastname);
        etc...
        return sb.ToString();
    }
}

Now you can create a list of Persons:

C#

List<Person> persons = [];

Read your data source and fill the list:

C#

while (data.Read())
{
    var p = new Person();
    p.Id        = data ["id"];
    p.Firstname = data ["firstname"];
    aso...

    persons.Add (p);
};

...

foreach (var person in persons)
{
    Console.WriteLine (person);
}

This short example is just one of many possible approaches to collect data in your application.

George Swan · Answer 2 · 2024-03-28T10:18:00

I would avoid using StringBuilder in your examples. The String.Join method is very useful for expanding a collection of strings. You can try something along these lines.

C#

public static void Main()
 {
     object[][] data =
     [
     ["Id", 1,"Name", "Alice","Age", 30,"City", "New York","Occupation", "Engineer",
     "Hobby", "Reading"],
     ["Id", 2, "Name", "Bob", "Age", 28],
     ["Id", 3, "Name", "Charlie", "Age", 35]
     ];

     List<string> list = [];
     foreach (object[] row in data)
     {
         var result = string.Join(' ', row);
         list.Add(result);
     }
     Console.WriteLine(string.Join("\r\n", list));
     Console.ReadLine();
 }
 /** Prints:
  Id 1 Name Alice Age 30 City New York Occupation Engineer Hobby Reading
  Id 2 Name Bob Age 28
  Id 3 Name Charlie Age 35 
  **/

Any possibility to fine tuning below code...

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