app.config 小插曲

在 "Windows Workflow Foundation 新一代工作流程開發實務" 中，6.2 的範例 MyWSExerciseSolution (P206) 中，app.config 有一個小小的插曲：

<configSections> 一定要放在 <configuration> 的第一個位置，如果像原先一樣把 <connectionStrings> 放在第一個，就會產生以下的錯誤訊息 ##CONTINUE##

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
      <section name="WSExercise.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    </sectionGroup>
  </configSections>
  <applicationSettings>
    <WSExercise.Properties.Settings>
      <setting name="WSExercise_ProductService_Service1" serializeAs="String">
        <value>http://localhost/QuantityWS/ProductService.asmx</value>
      </setting>
    </WSExercise.Properties.Settings>
  </applicationSettings>
  <connectionStrings>
    <add name="WFNote" connectionString="data source=.;initial catalog=wfnote;integrated security=sspi"/>
  </connectionStrings>
</configuration>

System.TypeInitializationException 未處理
  Message="'System.Workflow.Runtime.WorkflowTrace' 的型別初始設定式發生例外狀況。"
  Source="System.Workflow.Runtime"
  TypeName="System.Workflow.Runtime.WorkflowTrace"
  StackTrace:
       於 System.Workflow.Runtime.WorkflowRuntime.PrivateInitialize(WorkflowRuntimeSection settings)
       於 System.Workflow.Runtime.WorkflowRuntime..ctor()
       於 WSExercise.Program.Main(String[] args) 於 D:\VC++.Net\Workflow\MyWSExerciseSolution\WSExercise\Program.cs: 行 19
  InnerException: System.Configuration.ConfigurationErrorsException
       Message="組態系統無法初始化"
       Source="System.Configuration"
       BareMessage="組態系統無法初始化"
       Line=0
       StackTrace:
            於 System.Configuration.ClientConfigurationSystem.EnsureInit(String configKey)
            於 System.Configuration.ClientConfigurationSystem.PrepareClientConfigSystem(String sectionName)
            於 System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String sectionName)
            於 System.Configuration.ConfigurationManager.GetSection(String sectionName)
            於 System.Configuration.PrivilegedConfigurationManager.GetSection(String sectionName)
            於 System.Diagnostics.DiagnosticsConfiguration.GetConfigSection()
            於 System.Diagnostics.DiagnosticsConfiguration.Initialize()
            於 System.Diagnostics.DiagnosticsConfiguration.get_Sources()
            於 System.Diagnostics.TraceSource.Initialize()
            於 System.Diagnostics.TraceSource.set_Switch(SourceSwitch value)
            於 System.Workflow.Runtime.WorkflowTrace..cctor()
       InnerException: System.Configuration.ConfigurationErrorsException
            Message="每個組態檔只允許一個 <configSections> 項目，而且 (如果有) 它必須是根 <configuration> 項目的第一個子系。 (D:\\VC++.Net\\Workflow\\MyWSExerciseSolution\\WSExercise\\bin\\Debug\\WSExercise.exe.Config line 6)"
            Source="System.Configuration"
            BareMessage="每個組態檔只允許一個 <configSections> 項目，而且 (如果有) 它必須是根 <configuration> 項目的第一個子系。"
            Filename="D:\\VC++.Net\\Workflow\\MyWSExerciseSolution\\WSExercise\\bin\\Debug\\WSExercise.exe.Config"
            Line=6
            StackTrace:
                 於 System.Configuration.ConfigurationSchemaErrors.ThrowIfErrors(Boolean ignoreLocal)
                 於 System.Configuration.BaseConfigurationRecord.ThrowIfParseErrors(ConfigurationSchemaErrors schemaErrors)
                 於 System.Configuration.BaseConfigurationRecord.ThrowIfInitErrors()
                 於 System.Configuration.ClientConfigurationSystem.EnsureInit(String configKey)
            InnerException: