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POHow to retrieve the string value of a custom C# resource class constant?
 

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  1. POHow to retrieve the string value of a custom C# resource class constant?
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    <p>I have created the following custom ValidationAttribute: </p> <pre><code>public class DateRangeAttribute : ValidationAttribute, IClientValidatable { public DateTime MinimumDate = new DateTime(1901, 1, 1); public DateTime MaximumDate = new DateTime(2099, 12, 31); public DateRangeAttribute(string minDate, string maxDate, string errorMessage) { MinimumDate = DateTime.Parse(minDate); MaximumDate = DateTime.Parse(maxDate); ErrorMessage = string.Format(errorMessage, MinimumDate.ToString("MM/dd/yyyy"), MaximumDate.ToString("MM/dd/yyyy")); } } </code></pre> <p>that I would like to use in my MVC4 view model as follows:</p> <pre><code>[DateRange(Resources.MinimumDate, Resources.MaximumDate, "Please enter a date between {0} and {1}")] </code></pre> <p><em>Resources</em> is a generated resources class based on a set of options stored in a SQL database. A simplified version of the generated code for the above two resource properties is:</p> <pre><code>public class Resources { public const string MinimumDate = "PropMinimumDate"; public static string PropMinimumDate { get { return "12/15/2010" } } public const string MaximumDate = "PropMaximumDate"; public static string PropMaximumDate { get { return "12/15/2012" } } } </code></pre> <p>While I do not understand how it works, I do understand that typical usage of resources in ValidationAttributes will automatically map <em>Resources.MinimumDate</em> to <em>PropMinimumDate</em> and return the value "12/15/2010".</p> <p>What I am cannot figure out is how to manually make that programmatic leap myself so I can pass in the two date values into my custom ValidatorAttribute. As presently coded, <em>"PropMinimumDate"</em> and <em>"PropMaximumDate"</em> are the <em>minDate</em> and <em>maxDate</em> parameter values (respectively) passed into the constructor of the DateRangeAttribute.</p> <p>If I try</p> <pre><code>[DateRange(Resources.PropMinimumDate, Resources.PropMaximumDate, "Please enter a date between {0} and {1}")] </code></pre> <p>I receive the compile error: </p> <p><em>An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type</em></p> <p>Is there a way to accomplish this task, or am I attempting the impossible? </p>
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