Query data using "Contains" keyword in Dynamic Linq in C#

Query data using "Contains" keyword in Dynamic Linq in C#

To query data using the Contains keyword in Dynamic LINQ in C#, you can use the Where method to filter a Queryable object using a lambda expression. Inside the lambda expression, you can use the Contains method to check if a string contains a specific substring.

Here's an example:

using System.Linq.Dynamic; // Create a list of strings List<string> myList = new List<string>() { "apple", "banana", "orange", "grape" }; // Convert the list to a Queryable object var queryable = myList.AsQueryable(); // Filter the Queryable object using the Contains method var result = queryable.Where("it.Contains(\"an\")"); // Iterate over the results foreach (var item in result) { Console.WriteLine(item); }

In this example, we're creating a list of strings called myList, and converting it to a Queryable object using the AsQueryable method. We're then filtering the Queryable object using the Where method and a lambda expression that checks if the string contains the substring "an". Note that we're using the it keyword to refer to the current element in the Queryable object.

The Where method returns a new Queryable object that contains only the elements that match the filter. We can iterate over the results using a foreach loop and print each element to the console.

You can also use the Contains method with other data types, such as integers or dates, by converting the value to a string and then using the Contains method.

Examples

  1. "Dynamic LINQ Contains for filtering in C#"

    • Description: Learn how to use the Contains keyword in Dynamic LINQ to filter data based on a collection of values.
    • Code:
      var filteredData = data.Where("PropertyName.Contains(@0)", "TargetValue").ToList();

  2. "Dynamic LINQ Contains with case-insensitive comparison"

    • Description: Explore how to perform a case-insensitive Contains operation in Dynamic LINQ for case-insensitive filtering.
    • Code:
      var filteredData = data.Where("PropertyName.ToLower().Contains(@0)", "targetvalue").ToList();

  3. "Dynamic LINQ Contains with multiple values"

    • Description: Understand how to use Dynamic LINQ to filter data based on the presence of multiple values using the Contains keyword.
    • Code:
      var values = new[] { "Value1", "Value2", "Value3" }; var filteredData = data.Where($"PropertyName.Contains(@0) || PropertyName.Contains(@1) || PropertyName.Contains(@2)", values).ToList();

  4. "Dynamic LINQ Contains for numeric filtering"

    • Description: Learn how to apply Contains in Dynamic LINQ for numeric filtering to find values within a range.
    • Code:
      var filteredData = data.Where("NumericPropertyName.Contains(@0)", 42).ToList();

  5. "Dynamic LINQ Contains with StringComparison for case-insensitivity"

    • Description: Explore how to use StringComparison in Dynamic LINQ for case-insensitive Contains filtering.
    • Code:
      var filteredData = data.Where("PropertyName.Contains(@0, StringComparison.OrdinalIgnoreCase)", "TargetValue").ToList();

  6. "Dynamic LINQ Contains with nested property"

    • Description: Understand how to use Dynamic LINQ for Contains on nested properties in your data model.
    • Code:
      var filteredData = data.Where("NestedProperty.PropertyName.Contains(@0)", "TargetValue").ToList();

  7. "Dynamic LINQ Contains for filtering DateTime values"

    • Description: Learn how to use Contains in Dynamic LINQ to filter DateTime values within a specified range.
    • Code:
      var startDate = DateTime.Now.AddDays(-7); var endDate = DateTime.Now; var filteredData = data.Where($"DateProperty >= @0 && DateProperty <= @1", startDate, endDate).ToList();

  8. "Dynamic LINQ Contains with wildcard search"

    • Description: Explore how to perform wildcard search using Contains in Dynamic LINQ for flexible text filtering.
    • Code:
      var filteredData = data.Where("PropertyName.Contains(@0)", "PartialValue").ToList();

  9. "Dynamic LINQ Contains for filtering with multiple conditions"

    • Description: Understand how to combine Contains with other conditions in Dynamic LINQ for more complex data filtering.
    • Code:
      var filteredData = data.Where("PropertyName.Contains(@0) && NumericProperty > @1", "TargetValue", 42).ToList();

  10. "Dynamic LINQ Contains with null-check"

    • Description: Learn how to use Contains in Dynamic LINQ with a null-check to filter non-null values.
    • Code:
      var filteredData = data.Where("PropertyName != null && PropertyName.Contains(@0)", "TargetValue").ToList();

More Tags

java-6 phpexcel morphological-analysis catransition aiohttp semaphore kivy android-uiautomator robocopy icommand

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