如何通过 .NET 在 MongoDB 中创建索引 [英] How to create indexes in MongoDB via .NET

问题描述

我已经使用 MongoDB C# 驱动程序以编程方式创建了一个新的文档集合.

I've programmatically created a new document collection using the MongoDB C# driver.

此时我想以编程方式创建和构建索引.我该怎么做?

At this point I want to create and build indexes programmatically. How can I do that?

推荐答案

从驱动程序的 v2.0 开始，有一个新的 async-only API.不应再使用旧 API，因为它是新 API 的阻塞外观，已弃用.

Starting from v2.0 of the driver there's a new async-only API. The old API should no longer be used as it's a blocking facade over the new API and is deprecated.

当前推荐的创建索引的方法是通过使用 Builders.IndexKeys 调用并等待 CreateOneAsync 和 IndexKeysDefinition:

The currently recommended way to create an index is by calling and awaiting CreateOneAsync with an IndexKeysDefinition you get by using Builders.IndexKeys:

static async Task CreateIndexAsync()
{
    var client = new MongoClient();
    var database = client.GetDatabase("HamsterSchool");
    var collection = database.GetCollection<Hamster>("Hamsters");
    var indexKeysDefinition = Builders<Hamster>.IndexKeys.Ascending(hamster => hamster.Name);
    await collection.Indexes.CreateOneAsync(new CreateIndexModel<Hamster>(indexKeysDefinition));
}

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