Unity:无法构造LogWriter类型

Question

对于以下"项目",我在解析Unity for DI时会遇到一个非常烦人且无法解释的错误.

InvalidOperationException - 无法构造LogWriter类型.您必须配置容器以提供此值.

？ex.Message; "依赖项的解析失败,类型= \"WindowsFormsApplication1.Performance \",name = \"(none)\".\ r \n发生异常时:解析时.\ r \n \nException是:InvalidOperationException - LogWriter类型不能是您必须配置容器以提供此值.\ r \n ---------------------------------- -------------\r\NAT异常的时间,该容器是:\ r \n\r \n解决WindowsFormsApplication1.Performance,(无)\ r \n解决参数\ "LW \" 构造WindowsFormsApplication1.Performance的(Microsoft.Practices.EnterpriseLibrary.Logging.LogWriter LW,Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ExceptionManager EM)\ r \n解决Microsoft.Practices.EnterpriseLibrary.Logging.LogWriter,(无)\r \n"

？ex.StackTrace; "在Microsoft.Practices.Unity.UnityContainer.DoBuildUp(类型t,对象存在,字符串名称,IEnumerable 1 resolverOverrides) in e:\\Builds\\Unity\\UnityTemp\\Compile\\Unity\\Unity\\Src\\UnityContainer.cs:line 515\r\n at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, String name, IEnumerable1 resolverOverrides)中的e:\ Builds\Unity\UnityTemp\Compile\Unity\Unity\Src\UnityContainer.cs:485行\在电子r \ñ在Microsoft.Practices.Unity.UnityContainer.Resolve(T型,字符串名称,ResolverOverride [] resolverOverrides):\构建\统一\ UnityTemp \编译\统一\统一\ SRC\UnityContainer.cs:线173 \在电子r \ñ在Microsoft.Practices.Unity.UnityContainerExtensions.Resolve [T](IUnityContainer容器,ResolverOverride []重写):\构建\统一\ UnityTemp \编译\统一\统一\ SRC\UnityContainerExtensions.cs:线504\r \ñ在WindowsFormsApplication1.Form1.OnLoad(EventArgs的发送)在d:\ Devzone \任务处理\ WindowsFormsApplication1\Form1.cs中:行33"

在一个表格中:

  protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            try
            {
                IUnityContainer container = new UnityContainer();
                Performance p = container.Resolve<Performance>();
            }
            catch (Exception ex)
            {

            }
        }

依赖类:

 public class Performance
    {
        public Performance(LogWriter lw, ExceptionManager em)
        {
        }
    }

配置文件:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
        <section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
    </configSections>
    <loggingConfiguration name="" tracingEnabled="true" defaultCategory="General">
        <listeners>
            <add name="Event Log Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FormattedEventLogTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FormattedEventLogTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                source="Enterprise Library Logging" formatter="Text Formatter"
                log="" machineName="." traceOutputOptions="None" />
        </listeners>
        <formatters>
            <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                template="Timestamp: {timestamp}{newline}&#xA;Message: {message}{newline}&#xA;Category: {category}{newline}&#xA;Priority: {priority}{newline}&#xA;EventId: {eventid}{newline}&#xA;Severity: {severity}{newline}&#xA;Title:{title}{newline}&#xA;Machine: {localMachine}{newline}&#xA;App Domain: {localAppDomain}{newline}&#xA;ProcessId: {localProcessId}{newline}&#xA;Process Name: {localProcessName}{newline}&#xA;Thread Name: {threadName}{newline}&#xA;Win32 ThreadId:{win32ThreadId}{newline}&#xA;Extended Properties: {dictionary({key} - {value}{newline})}"
                name="Text Formatter" />
        </formatters>
        <categorySources>
            <add switchValue="All" name="General">
                <listeners>
                    <add name="Event Log Listener" />
                </listeners>
            </add>
            <add switchValue="All" name="Category2" />
        </categorySources>
        <specialSources>
            <allEvents switchValue="All" name="All Events" />
            <notProcessed switchValue="All" name="Unprocessed Category" />
            <errors switchValue="All" name="Logging Errors &amp; Warnings">
                <listeners>
                    <add name="Event Log Listener" />
                </listeners>
            </errors>
        </specialSources>
    </loggingConfiguration>
    <exceptionHandling>
        <exceptionPolicies>
            <add name="Policy">
                <exceptionTypes>
                    <add name="All Exceptions" type="System.Exception, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
                        postHandlingAction="NotifyRethrow" />
                </exceptionTypes>
            </add>
        </exceptionPolicies>
    </exceptionHandling>
</configuration>

Answer 1

您需要将Enterprise Library扩展添加到容器中.没有它,容器不会读取配置文件,因此不知道如何创建Entlib对象,如LogWriter.