How to convert a data reader to dynamic query results in C#

How to convert a data reader to dynamic query results in C#

You can convert a data reader to dynamic query results in C# by using the ExpandoObject class to create a dynamic object and the IDataRecord interface to read the column values from the data reader. Here's an example:

public static List<dynamic> GetDynamicResults(SqlDataReader reader) { var results = new List<dynamic>(); while (reader.Read()) { dynamic result = new ExpandoObject(); var dict = result as IDictionary<string, object>; for (int i = 0; i < reader.FieldCount; i++) { dict.Add(reader.GetName(i), reader[i]); } results.Add(result); } return results; }

In this example, we create a new ExpandoObject and cast it to a dynamic type. We then use the IDataRecord interface to read the column values from the data reader and add them to a dictionary in the ExpandoObject.

Finally, we add the dynamic object to a list of dynamic query results and return the list.

You can call this method passing a SqlDataReader object as parameter to get a list of dynamic query results. Here's an example:

using (var connection = new SqlConnection(connectionString)) { connection.Open(); using (var command = new SqlCommand("SELECT * FROM MyTable", connection)) { using (var reader = command.ExecuteReader()) { var results = GetDynamicResults(reader); foreach (var result in results) { Console.WriteLine(result.MyColumn); } } } }

In this example, we open a SQL connection, create a SQL command to select all the columns from a table, execute the command, and call the GetDynamicResults method to get a list of dynamic query results. We then iterate over the results and print the value of a specific column (MyColumn in this case).

Examples

  1. Convert SqlDataReader to dynamic in C# using Reflection

    SqlDataReader reader = /* your SqlDataReader */; var result = new List<dynamic>(); while (reader.Read()) { var data = new ExpandoObject() as IDictionary<string, object>; for (int i = 0; i < reader.FieldCount; i++) { data[reader.GetName(i)] = reader[i]; } result.Add(data); }

    Description: This code uses an ExpandoObject to dynamically create properties for each column in the SqlDataReader and builds a list of dynamic objects.

  2. C# Convert SqlDataReader to dynamic using Dapper

    SqlDataReader reader = /* your SqlDataReader */; var result = SqlMapper.ParseDynamic(reader);

    Description: This code utilizes Dapper, a micro ORM, to directly parse the SqlDataReader into a dynamic result.

  3. Convert SqlDataReader to dynamic in C# with LINQ and ExpandoObject

    SqlDataReader reader = /* your SqlDataReader */; var result = Enumerable.Range(0, reader.FieldCount) .Select(i => new KeyValuePair<string, object>(reader.GetName(i), reader[i])) .ToDictionary(pair => pair.Key, pair => pair.Value);

    Description: This code uses LINQ to create a dictionary with column names as keys and corresponding values, representing dynamic results.

  4. C# Convert SqlDataReader to dynamic using dynamic type and List

    SqlDataReader reader = /* your SqlDataReader */; var result = new List<dynamic>(); while (reader.Read()) { dynamic data = new System.Dynamic.ExpandoObject(); for (int i = 0; i < reader.FieldCount; i++) { ((IDictionary<string, object>)data)[reader.GetName(i)] = reader[i]; } result.Add(data); }

    Description: This code uses the dynamic type and ExpandoObject to create dynamic objects for each row in the SqlDataReader.

  5. Convert SqlDataReader to dynamic in C# with Reflection and Tuple

    SqlDataReader reader = /* your SqlDataReader */; var result = new List<dynamic>(); while (reader.Read()) { var data = Tuple.Create( reader["Column1"], reader["Column2"], // add more columns as needed ); result.Add(data); }

    Description: This code uses Tuple and Reflection to dynamically create tuples representing each row in the SqlDataReader.

  6. C# Convert SqlDataReader to dynamic using Reflection and Anonymous Type

    SqlDataReader reader = /* your SqlDataReader */; var result = new List<dynamic>(); while (reader.Read()) { var data = new { Column1 = reader["Column1"], Column2 = reader["Column2"], // add more columns as needed }; result.Add(data); }

    Description: This code uses Reflection and anonymous types to dynamically create objects with properties for each column in the SqlDataReader.

  7. Convert SqlDataReader to dynamic in C# using LINQ and ExpandoObject

    SqlDataReader reader = /* your SqlDataReader */; var result = Enumerable.Range(0, reader.FieldCount) .ToDictionary(i => reader.GetName(i), i => reader[i]);

    Description: This code uses LINQ to create a dictionary with column names as keys and corresponding values, representing dynamic results.

  8. C# Convert SqlDataReader to dynamic using Reflection and Dictionary

    SqlDataReader reader = /* your SqlDataReader */; var result = new List<dynamic>(); while (reader.Read()) { var data = new Dictionary<string, object>(); for (int i = 0; i < reader.FieldCount; i++) { data[reader.GetName(i)] = reader[i]; } result.Add(data); }

    Description: This code uses Reflection and a dictionary to dynamically create objects with properties for each column in the SqlDataReader.

  9. Convert SqlDataReader to dynamic in C# with Reflection and ExpandoObject

    SqlDataReader reader = /* your SqlDataReader */; var result = new List<dynamic>(); while (reader.Read()) { dynamic data = new ExpandoObject(); var dictionary = (IDictionary<string, object>)data; for (int i = 0; i < reader.FieldCount; i++) { dictionary[reader.GetName(i)] = reader[i]; } result.Add(data); }

    Description: This code uses Reflection and ExpandoObject to dynamically create objects with properties for each column in the SqlDataReader.

  10. C# Convert SqlDataReader to dynamic using Reflection and List of Dictionary

    SqlDataReader reader = /* your SqlDataReader */; var result = new List<Dictionary<string, object>>(); while (reader.Read()) { var data = new Dictionary<string, object>(); for (int i = 0; i < reader.FieldCount; i++) { data[reader.GetName(i)] = reader[i]; } result.Add(data); }

    Description: This code uses Reflection and a list of dictionaries to dynamically create objects with properties for each column in the SqlDataReader.

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