ComparisonOperator
内容
[
隐藏
]ComparisonExpression.ComparisonOperator property
获取比较运算符。
public string ComparisonOperator { get; }
例子
展示如何实现 IF 和 COMPARE 字段的自定义评估。
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();
// 我们在此示例中使用的字段代码:
// 1." IF {0} {1} {2} \"真参数\" \"假参数\" "。
// 2.“比较{0} {1} {2}”。
Field field = builder.InsertField(string.Format(fieldCode, left, @operator, right), null);
// 如果“comparisonResult”未定义,我们使用字符串而不是布尔值创建“ComparisonEvaluationResult”。
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>
/// FieldIf 和 FieldCompare 的比较表达式评估。
/// </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[]>();
}
也可以看看
- class ComparisonExpression
- 命名空间 Aspose.Words.Fields
- 部件 Aspose.Words