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    <p>This should work, even if certainly not complete (nor elegant).</p> <pre><code>public static class LinqQueries { private static MethodInfo miTL = typeof(String).GetMethod("ToLower", Type.EmptyTypes); private static MethodInfo miS = typeof(String).GetMethod("StartsWith", new Type[] { typeof(String) }); private static MethodInfo miC = typeof(String).GetMethod("Contains", new Type[] { typeof(String) }); private static MethodInfo miE = typeof(String).GetMethod("EndsWith", new Type[] { typeof(String) }); public static IQueryable&lt;T&gt; FilterByString&lt;T&gt;(this IQueryable&lt;T&gt; query, Expression&lt;Func&lt;T, string&gt;&gt; propertySelector, StringOperator operand, string value) { ParameterExpression parameterExpression = null; var memberExpression = GetMemberExpression(propertySelector.Body, out parameterExpression); var dynamicExpression = Expression.Call(memberExpression, miTL); Expression constExp = Expression.Constant(value.ToLower()); switch (operand) { case StringOperator.StartsWith: dynamicExpression = Expression.Call(dynamicExpression, miS, constExp); break; case StringOperator.Contains: dynamicExpression = Expression.Call(dynamicExpression, miC, constExp); break; case StringOperator.EndsWith: dynamicExpression = Expression.Call(dynamicExpression, miE, constExp); break; } var pred = Expression.Lambda&lt;Func&lt;T, bool&gt;&gt;(dynamicExpression, new[] { parameterExpression }); return query.Where(pred); } private static Expression GetMemberExpression(Expression expression, out ParameterExpression parameterExpression) { parameterExpression = null; if (expression is MemberExpression) { var memberExpression = expression as MemberExpression; while (!(memberExpression.Expression is ParameterExpression)) memberExpression = memberExpression.Expression as MemberExpression; parameterExpression = memberExpression.Expression as ParameterExpression; return expression as MemberExpression; } if (expression is MethodCallExpression) { var methodCallExpression = expression as MethodCallExpression; parameterExpression = methodCallExpression.Object as ParameterExpression; return methodCallExpression; } return null; } } </code></pre> <p>Will manage</p> <pre><code>xxx.FilterByString(m =&gt; m.Name,...) xxx.FilterByString(m =&gt; m.Test.Name,...) xxx.FilterByString(m =&gt; m.GetValue(),...)//GetValue() returns "string" </code></pre> <p>CAUTION : NullReferenceExceptions aren't managed (if Name is null, or Test is null, or Test.Name is null, or GetValue() returns null)...</p>
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    1. POhow to build case insensitive strong typed LINQ query in c#?
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    1. USRaphaël Althaus
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    1. COThanks! Your answer has helped.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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