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public static class LinqExtensions
{
public static IQueryable WhereLike(
    this IQueryable source,
    Expression> valueSelector,
    string value,
    char wildcard)
{
    return source.Where(BuildLikeExpression(valueSelector, value, wildcard));
}

public static Expression> BuildLikeExpression(
    Expression> valueSelector,
    string value,
    char wildcard)
{
    if (valueSelector == null)
        throw new ArgumentNullException("valueSelector");

    var method = GetLikeMethod(value, wildcard);

    value = value.Trim(wildcard);
    var body = Expression.Call(valueSelector.Body, method, Expression.Constant(value));

    var parameter = valueSelector.Parameters.Single();
    return Expression.Lambda>(body, parameter);
}

private static MethodInfo GetLikeMethod(string value, char wildcard)
{
    var methodName = "Contains";

    var textLength = value.Length;
    value = value.TrimEnd(wildcard);
    if (textLength > value.Length)
    {
        methodName = "StartsWith";
        textLength = value.Length;
    }

    value = value.TrimStart(wildcard);
    if (textLength > value.Length)
    {
        methodName = (methodName == "StartsWith") ? "Contains" : "EndsWith";
        textLength = value.Length;
    }

    var stringType = typeof(string);
    return stringType.GetMethod(methodName, new Type[] { stringType });
}
}