/// <summary>
/// Validates that the value of the specified
/// property does not contain any syntax errors.
/// </summary>
/// <param name="instance">
/// <para>The instance to validate.</para>
/// </param>
/// <param name="info">
/// <para>The property contaning the value to validate.</para>
/// </param>
/// <param name="errors">
/// <para>The collection to add any errors that occur durring the validation.</para>
/// </param>
public override void Validate(
object instance,
PropertyInfo info,
ValidationErrorCollection errors)
{
string expression = (string)info.GetValue(instance, null);
if (expression != null
&& expression.Length != 0)
{
try
{
Parser parser = new Parser();
parser.Parse(expression);
}
catch (SyntaxException e)
{
errors.Add(instance, info.Name, e.Message);
}
}
}
/// <summary>
/// Initializes a new instance of the
/// <see cref="ExpressionTextBox"/> class.
/// </summary>
public ExpressionTextBox()
: base()
{
parser = new Parser();
}
private BooleanExpression Parse()
{
parser = new Parser();
try
{
return parser.Parse(this.expressionTextBox.Text);
}
catch (SyntaxException ex)
{
MessageBox.Show(
SR.ParseFailedMessage(ex.Message),
SR.ParseFailedCaption,
MessageBoxButtons.OK,
MessageBoxIcon.Error);
return null;
}
}
private BooleanExpression GetParsedExpression(string ruleName)
{
AuthorizationRuleDataCollection authorizationRuleDataCollection = GetAuthorizationRules();
AuthorizationRuleData authorizationRuleData = authorizationRuleDataCollection[ruleName];
if (authorizationRuleData == null) return null;
string expression = authorizationRuleData.Expression;
Parser parser = new Parser();
return parser.Parse(expression);
}