How Can I Perform a Case-Insensitive Contains Query in LINQ?

Case-Insensitive Contains Query in LINQ

When performing a contains operation in LINQ queries, the default behavior is case-sensitive. However, there are situations when you may want to search for a substring in a case-insensitive manner.

One example is the following code, which searches for a facility item based on a description:

public IQueryable<FACILITY_ITEM> GetFacilityItemRootByDescription(string description)<br>{</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">return this.ObjectContext.FACILITY_ITEM.Where(fi => fi.DESCRIPTION.Contains(description));

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}

In this code, if the description parameter is uppercase, it will only find items that have descriptions that are also uppercase. To make this query case-insensitive, you can use the following approach:

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

This code converts both the description parameter and the DESCRIPTION property of each FACILITY_ITEM to lowercase before performing the contains operation. This ensures that the query will match items regardless of the case of the input.

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