在以前的版本中,我们可以在不知道它是否存在的情况下删除实体.
svc = new TestContext();
item = new TestEntity("item2pk","item2rk");
svc.AttachTo("TestTable",item,"*");
svc.DeleteObject(item);
svc.SaveChanges();
新的TableOperations没有此语法.我必须使用这种旧方法还是有办法？我想保持一致,因为现在我的所有代码都使用了第2版的新类.
编辑：标题具有误导性
解决方法
您需要使用TableOperation.Delete：
var storageAccount = CloudStorageAccount.DevelopmentStorageAccount;
var table = storageAccount.CreateCloudTableClient()
.GetTableReference("tempTable");
table.CreateIfNotExists();
// Add item.
table.Execute(TableOperation.Insert(new TableEntity("MyItems","123")));
// Load items.
var items = table.ExecuteQuery(new TableQuery<TableEntity>());
foreach (var item in items)
{
Console.WriteLine(item.PartitionKey + " - " + item.RowKey);
}
// Delete item (the ETAG is required here!).
table.Execute(TableOperation.Delete(new TableEntity("MyItems","123") { ETag = "*" }));
删除仅适用于存在的实体.即使旧客户端具有ContinueOnError选项,它也与批处理操作(as explained here)不兼容.
成功批量删除的唯一方法是,如果您不知道实体存在它,则首先添加它们(或者如果它们已经存在则替换它们)：
var ensureItemsBatch = new TableBatchOperation();
ensureItemsBatch.InsertOrReplace(new MyEntity("MyItems","123") { Active = false });
ensureItemsBatch.InsertOrReplace(new MyEntity("MyItems","456") { Active = false });
ensureItemsBatch.InsertOrReplace(new MyEntity("MyItems","789") { Active = false });
table.ExecuteBatch(ensureItemsBatch);
var deleteItemsBatch = new TableBatchOperation();
deleteItemsBatch.Delete(new MyEntity("MyItems","123") { ETag = "*" });
deleteItemsBatch.Delete(new MyEntity("MyItems","456") { ETag = "*" });
deleteItemsBatch.Delete(new MyEntity("MyItems","789") { ETag = "*" });
table.ExecuteBatch(deleteItemsBatch);
