'AmazonDynamoDBClient。PutItem(PutItemRequest)“”由于其保护级别而无法访问'

dynamodb的新用户,并尝试将其与my集成。净核心。

我在以下方面使用了该示例: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LowLevelDotNetItemsExample.html

以下是示例:

private static string tableName = "ProductCatalog";
private static AmazonDynamoDBClient client = new AmazonDynamoDBClient();

private static void CreateItem()
{
        var request = new PutItemRequest
        {
            TableName = tableName,
            Item = new Dictionary<string, AttributeValue>()
        {
            { "Id", new AttributeValue {
                  N = "1000"
              }},
            { "Title", new AttributeValue {
                  S = "Book 201 Title"
              }},
            { "ISBN", new AttributeValue {
                  S = "11-11-11-11"
              }},
            { "Authors", new AttributeValue {
                  SS = new List<string>{"Author1", "Author2" }
              }},
            { "Price", new AttributeValue {
                  N = "20.00"
              }},
            { "Dimensions", new AttributeValue {
                  S = "8.5x11.0x.75"
              }},
            { "InPublication", new AttributeValue {
                  BOOL = false
              } }
        }
        };
        client.PutItem(request);
    }

但当我运行代码时,我会发现错误:

Error   CS0122  'AmazonDynamoDBClient.PutItem(PutItemRequest)' is inaccessible due to its protection level
Error   CS0122  'AmazonDynamoDBClient.GetItem(GetItemRequest)' is inaccessible due to its protection level
and so on for all the request.

这里缺少什么?

谢谢