Joseph Doherty
62 lines
2.5 KiB
C#
62 lines
2.5 KiB
C#
using System;
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using System.Runtime.InteropServices;
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namespace MxGateway.Worker.MxAccess;
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/// <summary>Thrown when the worker fails to instantiate the MXAccess COM object.</summary>
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public sealed class MxAccessCreationException : Exception
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{
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/// <summary>Initializes a new instance with diagnostic info from the inner exception.</summary>
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/// <param name="innerException">The exception that caused the creation failure.</param>
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public MxAccessCreationException(Exception innerException)
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: base(
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$"Failed to create MXAccess COM object {MxAccessInteropInfo.ComClassName} ({MxAccessInteropInfo.ProgId}).",
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innerException)
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{
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AttemptedProgId = MxAccessInteropInfo.ProgId;
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AttemptedClsid = MxAccessInteropInfo.Clsid;
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AttemptedComClassName = MxAccessInteropInfo.ComClassName;
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HResult = innerException.HResult;
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}
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/// <summary>The ProgID that was attempted during COM instantiation.</summary>
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public string AttemptedProgId { get; }
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/// <summary>The CLSID that was attempted during COM instantiation.</summary>
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public string AttemptedClsid { get; }
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/// <summary>The COM class name that was attempted during instantiation.</summary>
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public string AttemptedComClassName { get; }
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/// <summary>The captured HResult from the instantiation failure, or null if zero.</summary>
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public int? CapturedHResult => HResult == 0 ? null : HResult;
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/// <summary>Wraps an exception in MxAccessCreationException if it is not already.</summary>
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/// <param name="exception">The exception to wrap.</param>
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/// <returns>An MxAccessCreationException wrapping the input exception.</returns>
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public static MxAccessCreationException From(Exception exception)
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{
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return exception is MxAccessCreationException creationException
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? creationException
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: new MxAccessCreationException(exception);
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}
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/// <summary>Extracts the HResult from an exception, handling MXAccess and COM exceptions specially.</summary>
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/// <param name="exception">The exception to extract the HResult from.</param>
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/// <returns>The HResult value, or null if zero.</returns>
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public static int? ExtractHResult(Exception exception)
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{
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if (exception is MxAccessCreationException creationException)
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{
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return creationException.CapturedHResult;
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}
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if (exception is COMException comException)
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{
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return comException.HResult;
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}
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return exception.HResult == 0 ? null : exception.HResult;
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}
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}
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