Question

我正在寻找如何正确删除操作的最佳做法。

例如我的减速机中有一系列照片。其中一项功能是选择要删除的功能。我决定存储在反应状态下选择的项目。我存储了ID数组。

因此，在删除操作后，我必须从redux存储中删除照片并清除处于反应状态的所选数组。

我的建议是订阅承诺并执行以下操作：

 this.props.deletePhotos(selected)
.then(() => {
   this.setState({ selected: [] })
 })
.catch((err) => {
   console.log(err)
})

但是有人说这是一个不好的做法。这是真的吗？如何以正确的方式改变它？

Answer 1

您需要遵守的主要原则是您的州应始终有效。通过使用承诺，您将删除照片，呈现无效状态，然后更新反应状态。即使这样的渲染确实无关紧要，但这并不是很好的做法。

您可能无法在承诺中设置状态：

Test Name:	TestCase1
Test FullName:	Automation.Excel_TC_1.TestCase1
Test Source:	C:\Safety_dan\-localRepoVisualStudioC#\Automation\Excel_TC_1.cs : line 32
Test Outcome:	Failed
Test Duration:	0:00:00.005

Result StackTrace:	
at System.Data.OleDb.OleDbServicesWrapper.GetDataSource(OleDbConnectionString constr, DataSourceWrapper& datasrcWrapper)
   at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)
   at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionInternal.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.OleDb.OleDbConnection.Open()
   at Automation.ExcelReader.ReadExcelData(String excelFile, String sheetname) in C:\Safety_dan\-localRepoVisualStudioC#\Automation\Excel_TC_1.cs:line 27
   at Automation.Excel_TC_1.<get_BudgetData>d__2.MoveNext() in C:\Safety_dan\-localRepoVisualStudioC#\Automation\Excel_TC_1.cs:line 20
   at NUnit.Framework.TestCaseSourceAttribute.GetTestCasesFor(IMethodInfo method) in C:\src\nunit\nunit\src\NUnitFramework\framework\Attributes\TestCaseSourceAttribute.cs:line 177
Result Message:	System.InvalidOperationException : The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine.

或者，如果你想做一些比清除更复杂的事情，你可以使用const selected = this.state.selected this.props.deletePhotos(selected) .catch((err) => { console.log(err) }) this.setState({selected: []})并修改状态，如果相关的道具被改变，可能来自redux。

另一个选择是，如果你完成了输入，你只需要在下一个渲染中渲染组件，状态就会被自动清除，因为它将被卸载。

如何正确删除操作？

1 个答案: