RevitAPI: 事务的错误或警告信息的处理 - Failure Processor of Transaction

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很多时候，当我们提交一个事务的时候，Revit会弹出错误框或者警告框，而该错误或警告无法使用Try-Catch捕获。

using (Transaction transaction = new Transaction(RevitDoc)){    try    {        transaction.Start("TransactionName");        // do your stuff        transaction.Commit();    }    catch (Exception ex)    {        if (transaction.GetStatus() == TransactionStatus.Started)            transaction.RollBack();    }}

例如像下面的错误：

这个时候就要用到FailureProcessor了。

首先我们需要定义一个实现了接口IFailuresPreprocessor的类。

public class MyFailuresPreProcessor : IFailuresPreprocessor{    private string _failureMessage;    private bool _hasError;    public string FailureMessage    {        get { return _failureMessage; }        set { _failureMessage = value; }    }    public bool HasError    {        get { return _hasError; }        set { _hasError = value; }    }    public FailureProcessingResult PreprocessFailures(FailuresAccessor failuresAccessor)    {        var failures = failuresAccessor.GetFailureMessages();        if (failures.Count == 0)            return FailureProcessingResult.Continue;        foreach (var failure in failures)        {            if (failure.GetSeverity() == FailureSeverity.Error)            {                _failureMessage = failure.GetDescriptionText(); // get the failure description                _hasError = true;                return FailureProcessingResult.ProceedWithRollBack;            }            if (failure.GetSeverity() == FailureSeverity.Warning)            {                failuresAccessor.DeleteWarning(failure);            }        }        return FailureProcessingResult.Continue;    }}

这里通过PreprocessFailures方法我们就可以捕获错误或者警告，然后进行我们想要的处理。

FailuresAccessor.GetFailureMessages() 获取所有的失败信息
FailureMessageAccessor.GetSeverity() 可以得知它是警告还是错误
FailureMessageAccessor.GetDescriptionText() 可以获取错误的文字
FailureMessageAccessor.GetFailureDefinitionId() 获取失败的定义
FailuresAccessor.DeleteWarning删除警告，或者FailuresAccessor.DeleteAllWarnings直接删除所有警告

然后在Transaction类里面设置FailuresPreprocessor，使用FailureHandlingOptions options = transaction.GetFailureHandlingOptions();
获取FailureHandlingOptions，然后使用options.SetFailuresPreprocessor(IFailuresPreprocessor)来设置FailuresPreprocessor。

代码如下：

using (Transaction transaction = new Transaction(RevitDoc)){    try    {        transaction.Start("TransactionName");        FailureHandlingOptions options = transaction.GetFailureHandlingOptions();        MyFailuresPreProcessor failureProcessor = new MyFailuresPreProcessor();        options.SetFailuresPreprocessor(failureProcessor);        transaction.SetFailureHandlingOptions(options);        // do your operations        var status = transaction.Commit();        if (status != TransactionStatus.Committed)        {            if (failureProcessor.HasError)            {                TaskDialog.Show("ERROR", failureProcessor.FailureMessage);            }        }    }    catch (Exception ex)    {        if (transaction.GetStatus() == TransactionStatus.Started)            transaction.RollBack();    }}

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