Azure 獲取單個實體的表存儲問題

Question

我正在創建一個非常簡單的表存儲，它存儲一個 int 值。

但是，我無法獲取代碼以從存儲中獲取實體工作。

model class：

public class SomeClass: ITableEntity
{
    public SomeClass(string someKey, int someNumber)
    {
        PartitionKey = someKey;
        RowKey = someKey;
        ETag = new ETag("*");
        SomeNumber= someNumber;
    }

    public string PartitionKey { get; set; }
    public string RowKey { get; set; }
    public DateTimeOffset? Timestamp { get; set; } = DateTimeOffset.Now;
    public ETag ETag { get; set; } 
    public int SomeNumber { get; }
}

客戶端class如下：

public class AzureTableClient : IAzureTableClient
    {
        private readonly IConfiguration _configuration;
        private readonly TableServiceClient _tableServiceClient;
        
        public AzureTableClient(IConfiguration configuration, TableServiceClient tableServiceClient)
        {
            _configuration = configuration;
            _tableServiceClient = tableServiceClient;
        }
        
        public void CreateEntity(string someKey, int count)
        {
            var tableClient = CreateTableServiceClient();

            var response = tableClient.UpsertEntity(new SomeClass(someKey, count));
        }

        public int GetSomeNumber(string someKey)
        {
            var tableClient = CreateTableServiceClient();

            return tableClient.GetEntity<TodaysZipCount>(rowKey: someKey, partitionKey: someKey).Value.SomeNumber;
        }

        private TableClient CreateTableServiceClient()
        {
            var tableName = _configuration.GetValue<string>("TableName");
            
            var tableClient =_tableServiceClient.GetTableClient(tableName);

            tableClient.CreateIfNotExists();

            return tableClient;
        }
    }

以下代碼給了我以下錯誤消息：

return tableClient.GetEntity<TodaysZipCount>(rowKey: dateKey, partitionKey: dateKey).Value.TodaysCount;

錯誤：

Error   CS0310  'SomeClass' must be a non-abstract type with a public parameterless constructor in order to use it as parameter 'T' in the generic type or method 'TableClient.GetEntity<T>(string, string, IEnumerable<string>, CancellationToken)'    

我已經按照文檔中的內容完成了所有工作......這里出了什么問題？

Answer 1

正如錯誤消息所說，您需要為您的實體創建一個public parameterless constructor 。

請加

public SomeClass()
{
}

到您的SomeClass定義，錯誤應該 go 消失。