Question

尝试在设计器中打开我的某些表单时出错。

这是堆栈跟踪：

    at System.ComponentModel.ReflectPropertyDescriptor.SetValue(Object component, Object value)
at Microsoft.VisualStudio.Shell.Design.VsTargetFrameworkPropertyDescriptor.SetValue(Object component, Object value)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializePropertyAssignStatement(IDesignerSerializationManager manager, CodeAssignStatement statement, CodePropertyReferenceExpression propertyReferenceEx, Boolean reportError)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeAssignStatement(IDesignerSerializationManager manager, CodeAssignStatement statement)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement(IDesignerSerializationManager manager, CodeStatement statement)

这是我的app.config

<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="Main.ConnectionString" value="Server=localhost;Database=ACTUAL_DB_NAME_HERE;User ID=ACTUAL_USER;Password=ACTUAL_PASSWORD;"/>
  </appSettings>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup>
</configuration>

Answer 1

当您尝试在设计器中打开表单时，表单无法访问您的app.config。这是因为您的程序没有运行，并且表单不是为了显示数据库中的相关数据。这是设计的。它旨在显示表单布局和视觉效果。因此，在设计模式下，不得尝试打开数据库连接，读取文件，播放视频等。

有关详细信息，请参阅this question。

如果此表单上的组件是由您编写的，请尝试在下面的组件2015-09-29 14:10:27,133 WARN [http-8080-2] LegacyFlexJsonExceptionMessageConverter: - Generated Key Name(s) not specificed. Using the generated keys features requires specifying the name(s) of the generated column(s) for User ID: 805, Request ID: f8da3bb5-0613-4a74-9ca8-95a6ab4f1692, clientIP: 127.0.0.1 uri: /admin/dataInsert, Request Parameters: org.springframework.dao.InvalidDataAccessApiUsageException: Generated Key Name(s) not specificed. Using the generated keys features requires specifying the name(s) of the generated column(s) at org.springframework.jdbc.core.simple.AbstractJdbcInsert.prepareStatementForGeneratedKeys(AbstractJdbcInsert.java:530) at org.springframework.jdbc.core.simple.AbstractJdbcInsert.access$0(AbstractJdbcInsert.java:528) at org.springframework.jdbc.core.simple.AbstractJdbcInsert$1.createPreparedStatement(AbstractJdbcInsert.java:448) at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:581) at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:843) at org.springframework.jdbc.core.simple.AbstractJdbcInsert.executeInsertAndReturnKeyHolderInternal(AbstractJdbcInsert.java:445) at org.springframework.jdbc.core.simple.AbstractJdbcInsert.executeInsertAndReturnKeyInternal(AbstractJdbcInsert.java:426) at org.springframework.jdbc.core.simple.AbstractJdbcInsert.doExecuteAndReturnKey(AbstractJdbcInsert.java:380) at org.springframework.jdbc.core.simple.SimpleJdbcInsert.executeAndReturnKey(SimpleJdbcInsert.java:122) at com.gridpoint.energy.datamodel.impl.PGDataFixBackUpManagerBean.backupDataInRange(PGDataFixBackUpManagerBean.java:79) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:319) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)事件中包装破坏设计器的代码：

Load

编辑：最佳做法是将连接字符串存储在app.config的专用部分中。 Here is a good explanation这个。

VS2015 Designer错误：键＆＃39; Main.ConnectionString＆＃39;在appSettings配置部分中不存在

1 个答案: