如何在 .NET 中使用 GroupDocs Search API 建立索引

dotnet add package GroupDocs.Redaction

Install-Package GroupDocs.Redaction

// Initialize the Redactor with a file path or stream
using (Redactor redactor = new Redactor("input.docx"))
{
    // Your redaction code here
}

// Direct answer (40‑70 words):
Create a new `Index` instance by specifying the folder path where the index will reside, then invoke `Create()` to initialise the storage structures. The method writes index headers, term dictionaries, and a lock file, making the folder ready for document addition. This step is required only once per index location.

using GroupDocs.Search;

string indexFolder = @"YOUR_DOCUMENT_DIRECTORY/AdvancedUsage/Indexing/DeleteIndexedPaths";
Index index = new Index(indexFolder);
// This line initializes an index at the provided folder path.

// Direct answer (40‑70 words):
Use `index.AddFolder("C:\\Docs")` or `index.Add("C:\\Docs\\file.pdf")` to feed documents into the index. The API streams each file, extracts searchable text, and stores term‑frequency data without loading the entire file into memory, which lets you index thousands of large PDFs efficiently.

string documentsFolder1 = @"YOUR_DOCUMENT_DIRECTORY";
string documentsFolder2 = @"YOUR_DOCUMENT_DIRECTORY2";

index.Add(documentsFolder1);  // Adding the first folder of documents to the index
index.Add(documentsFolder2);  // Adding the second folder of documents to the index

// Direct answer (40‑70 words):
Call `index.GetIndexedDocuments()` to obtain a collection of `IndexedDocumentInfo` objects, each containing the original file path, document ID, and indexing timestamp. Loop through the collection and output the `FilePath` property to confirm that every expected file has been successfully added.

string[] indexedPaths1 = index.GetIndexedPaths();
foreach (string path in indexedPaths1)
{
    Console.WriteLine(path); // Outputs the document paths
}

// Direct answer (40‑70 words):
Invoke `index.Delete("C:\\Docs\\obsolete.pdf")` or `index.Delete(documentId)` to purge a specific document from the index. The method removes all term entries linked to that file, updates the term dictionary, and frees the space on disk, ensuring that future queries no longer return the deleted content.

using GroupDocs.Search.Options;

string[] pathsToDelete = { @"YOUR_DOCUMENT_DIRECTORY" };
DeleteResult deleteResult = index.Delete(pathsToDelete, new UpdateOptions());
// This deletes specified document paths from the index.

// Direct answer (40‑70 words):
Run `index.GetIndexedDocuments()` again and compare the resulting list with the pre‑deletion list. The missing file path confirms successful deletion, while the remaining entries confirm the index’s integrity. This verification step is especially important in automated pipelines.

string[] indexedPaths2 = index.GetIndexedPaths();
foreach (string path in indexedPaths2)
{
    Console.WriteLine(path); // Displays remaining paths after deletion
}