How Can I Make LINQ's Contains Method Case-Insensitive?

LINQ Contains Method: Overcoming Case Sensitivity

The LINQ Contains method provides a powerful way to check for the presence of a specific substring in a string. However, by default, it performs a case-sensitive comparison, which may not be desirable in some scenarios. This article explains how to make the Contains method case insensitive using a simple modification.

Making Contains Case Insensitive

To make the Contains method case insensitive, you can use the ToLower method to convert both the string to be checked and the substring into lowercase before performing the comparison. This modification ignores case differences, ensuring that matches are found regardless of letter casing.

Example Modification

Consider the following LINQ query:

public IQueryable<FACILITY_ITEM> GetFacilityItemRootByDescription(string description)
{
    return this.ObjectContext.FACILITY_ITEM.Where(fi => fi.DESCRIPTION.Contains(description));
}

This code performs a case-sensitive comparison, meaning that "FACILITY" would not match "facility". To make this comparison case insensitive, the following modification can be applied:

fi => fi.DESCRIPTION.ToLower().Contains(description.ToLower())

This modification converts both fi.DESCRIPTION and description to lowercase before performing the Contains comparison. As a result, the query will now match "FACILITY" with "facility" and vice versa.

Conclusion

By incorporating the ToLower method into the Contains comparison, you can easily make LINQ queries case insensitive. This ensures that data retrieval and search operations are not affected by case differences, providing more flexibility and accurate results.

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