无法提取大文件的元数据属性

Question

我有一个大约 200MB 的 RVT 文件。当我使用 forge SDK (ObjectsApi.UploadObjectAsync()) 上传对象时，我多次遇到超时错误，但后来以某种方式上传了对象并提取了清单。

然而，在提取每个 sheet 的 modelViewMetadataProperties 时，它抛出了 URN is too big to extract 错误，我无法处理它。

如何使用大文件顺利上传对象和提取 modelViewMetadataProperties？

SDK 版本：Assembly Autodesk.Forge, Version=1.9.0.0

Answer 1

对于超时错误，这个link可能会有所帮助

关于元数据属性，文档说如果资源超过20mb，您可以使用forceget参数查询到true。该选项应该在 SDK 方法中可用。 URN Metadata Get Properties

Answer 2

要上传大文件，我建议您使用ObjectApi#UploadChunk instead. Here is an example demonstrating how to use it: https://github.com/yiskang/ForgeResumableUploadProgressDemo/blob/master/ForgeResumableUploadProgressDemo/Program.cs#L93

关于属性问题，请按照Alex的建议添加forceget参数并设置为true。这是它的 declaration:

/// <summary>
/// 
/// </summary>
/// <remarks>
/// Returns a list of properties for each object in an object tree. Properties are returned according to object ID and do not follow a hierarchical structure.  The following image displays a typical list of properties for a Revit object:  ![](https://developer.doc.autodesk.com/bPlouYTd/7/_images/Properties.png)  To call this endpoint you need to first call the [GET {urn}/metadata](https://developer.autodesk.com/en/docs/model-derivative/v2/reference/http/urn-metadata-GET) endpoint, which returns a list of model view (metadata) IDs for a design input model. Select a model view (metadata) ID to use when calling the Get Properties endpoint.  Note that you can only get properties from a design input file that was previously translated into an SVF file. 
/// </remarks>
/// <exception cref="Autodesk.Forge.Client.ApiException">Thrown when fails to make API call</exception>
/// <param name="urn">The Base64 (URL Safe) encoded design URN </param>
/// <param name="guid">Unique model view ID. Call [GET {urn}/metadata](https://developer.autodesk.com/en/docs/model-derivative/v2/reference/http/urn-metadata-GET) to get the ID </param>
/// <param name="acceptEncoding">If specified with &#x60;gzip&#x60; or &#x60;*&#x60;, content will be compressed and returned in a GZIP format.  (optional)</param>
/// <param name="objectid">Object id which you want to query properties for.</param>
/// <param name="xAdsForce">If true - force retrieve the object tree even though it failed to be retrieved or got timeout (got 404 with error message) previously.</param>
/// <param name="forceget">If true - To force get the large resource even if it exceeded the expected maximum length (20 MB).</param>
/// <returns>Metadata</returns>
/*Metadata*/
dynamic GetModelviewProperties (string urn, string guid, string acceptEncoding = null, List<int> objectIds = null, bool xAdsForce = false, bool forceget = false);

这是它的用法示例：

derivativeApi.GetModelviewProperties( urn, guid, null, null, false, true );

无法提取大文件的元数据属性

Cant extract metadata properties of large files

autodesk-forge