ComparisonExpressionEvaluator
Contenu
[
Cacher
]FieldOptions.ComparisonExpressionEvaluator property
Obtient ou définit l’évaluateur des expressions de comparaison de champs.
public IComparisonExpressionEvaluator ComparisonExpressionEvaluator { get; set; }
Exemples
Montre comment implémenter une évaluation personnalisée pour les champs IF et COMPARE.
public void ConditionEvaluationExtensionPoint(string fieldCode, sbyte comparisonResult, string comparisonError,
string expectedResult)
{
const string left = "\"left expression\"";
const string @operator = "<>";
const string right = "\"right expression\"";
DocumentBuilder builder = new DocumentBuilder();
// Codes de champs que nous utilisons dans cet exemple :
// 1. " SI {0} {1} {2} \"vrai argument\" \"faux argument\" ".
// 2. " COMPARER {0} {1} {2} ".
Field field = builder.InsertField(string.Format(fieldCode, left, @operator, right), null);
// Si le "comparisonResult" n'est pas défini, nous créons "ComparisonEvaluationResult" avec une chaîne, au lieu de bool.
ComparisonEvaluationResult result = comparisonResult != -1
? new ComparisonEvaluationResult(comparisonResult == 1)
: comparisonError != null ? new ComparisonEvaluationResult(comparisonError) : null;
ComparisonExpressionEvaluator evaluator = new ComparisonExpressionEvaluator(result);
builder.Document.FieldOptions.ComparisonExpressionEvaluator = evaluator;
builder.Document.UpdateFields();
Assert.AreEqual(expectedResult, field.Result);
evaluator.AssertInvocationsCount(1).AssertInvocationArguments(0, left, @operator, right);
}
/// <summary>
/// Évaluation des expressions de comparaison pour FieldIf et FieldCompare.
/// </summary>
private class ComparisonExpressionEvaluator : IComparisonExpressionEvaluator
{
public ComparisonExpressionEvaluator(ComparisonEvaluationResult result)
{
mResult = result;
}
public ComparisonEvaluationResult Evaluate(Field field, ComparisonExpression expression)
{
mInvocations.Add(new[]
{
expression.LeftExpression,
expression.ComparisonOperator,
expression.RightExpression
});
return mResult;
}
public ComparisonExpressionEvaluator AssertInvocationsCount(int expected)
{
Assert.AreEqual(expected, mInvocations.Count);
return this;
}
public ComparisonExpressionEvaluator AssertInvocationArguments(
int invocationIndex,
string expectedLeftExpression,
string expectedComparisonOperator,
string expectedRightExpression)
{
string[] arguments = mInvocations[invocationIndex];
Assert.AreEqual(expectedLeftExpression, arguments[0]);
Assert.AreEqual(expectedComparisonOperator, arguments[1]);
Assert.AreEqual(expectedRightExpression, arguments[2]);
return this;
}
private readonly ComparisonEvaluationResult mResult;
private readonly List<string[]> mInvocations = new List<string[]>();
}
Voir également
- interface IComparisonExpressionEvaluator
- class FieldOptions
- espace de noms Aspose.Words.Fields
- Assemblée Aspose.Words