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  • Linq to sql LINQ到SQL，在db.SubmitChanges（）上失败

Linq to sql LINQ到SQL，在db.SubmitChanges（）上失败

linq-to-sql exception

Linq to sql LINQ到SQL，在db.SubmitChanges（）上失败,linq-to-sql,exception,insert-update,Linq To Sql,Exception,Insert Update,当我尝试更新时，我遇到了一个异常，Insert非常有效。。这就是： System.Data.Linq.dll中发生类型为“System.InvalidCastException”的第一次意外异常 另一个线索。。。是否可以先在一个表中插入，然后更新另一个表，最后在同一代码块中提交changes（）？ 我还评论InsertOnSubmit（）；我重建了dbml（删除并再次创建）更改了名称、上下文等。。 代码： 堆栈： System.InvalidCastException was caught

当我尝试更新时，我遇到了一个异常，Insert非常有效。。这就是： System.Data.Linq.dll中发生类型为“System.InvalidCastException”的第一次意外异常 另一个线索。。。是否可以先在一个表中插入，然后更新另一个表，最后在同一代码块中提交changes（）？ 我还评论InsertOnSubmit（）；我重建了dbml（删除并再次创建）更改了名称、上下文等。。 代码：

堆栈：

System.InvalidCastException was caught
  Message="No se puede convertir un objeto de tipo 'System.Int32' al tipo 'System.String'."
  Source="System.Data.Linq"
  StackTrace:
       en System.Data.Linq.IdentityManager.StandardIdentityManager.MultiKeyManager`3.TryCreateKeyFromValues(Object[] values, MultiKey`2& k)
       en System.Data.Linq.IdentityManager.StandardIdentityManager.MultiKeyManager`3.TryCreateKeyFromValues(Object[] values, MultiKey`2& k)
       en System.Data.Linq.IdentityManager.StandardIdentityManager.MultiKeyManager`3.TryCreateKeyFromValues(Object[] values, MultiKey`2& k)
       en System.Data.Linq.IdentityManager.StandardIdentityManager.MultiKeyManager`3.TryCreateKeyFromValues(Object[] values, MultiKey`2& k)
       en System.Data.Linq.IdentityManager.StandardIdentityManager.IdentityCache`2.Find(Object[] keyValues)
       en System.Data.Linq.IdentityManager.StandardIdentityManager.Find(MetaType type, Object[] keyValues)
       en System.Data.Linq.CommonDataServices.GetCachedObject(MetaType type, Object[] keyValues)
       en System.Data.Linq.ChangeProcessor.GetOtherItem(MetaAssociation assoc, Object instance)
       en System.Data.Linq.ChangeProcessor.BuildEdgeMaps()
       en System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode)
       en System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode)
       en System.Data.Linq.DataContext.SubmitChanges()
       en Demo.View.InformeMedico.btnGuardar_Click(Object sender, RoutedEventArgs e) en D:\cs_InformeMedico\app\InformeMedico.xaml.cs:línea 433
  InnerException:
感谢您的持续支持

XML:

<?xml version="1.0" encoding="utf-8"?>
<ordesignerObjectsDiagram dslVersion="1.0.0.0" absoluteBounds="0, 0, 11.625, 14" name="DataClasses1">
  <DataContextMoniker Name="/DB" />
  <nestedChildShapes>
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      <DataClassMoniker Name="/DB/EXAMENXATENCION" />
      <nestedChildShapes>
        <elementListCompartment Id="10f26c82-1f06-45d2-9488-da3d7d92e231" absoluteBounds="5.7650000000000006, 1.71, 1.9700000000000002, 2.67266845703125" name="DataPropertiesCompartment" titleTextColor="Black" itemTextColor="Black" />
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      <AssociationMoniker Name="/DB/ESTUDIO/ESTUDIO_EXAMENXATENCION" />
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        <elementListCompartment Id="239b98aa-995d-458c-b0e6-4211e108c99d" absoluteBounds="7.8900000000000006, 6.085, 1.9700000000000002, 2.015279134114583" name="DataPropertiesCompartment" titleTextColor="Black" itemTextColor="Black" />
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    </classShape>
    <classShape Id="516b8633-e8ba-43f7-bf23-8c18e055e9b4" absoluteBounds="1.625, 5, 2, 2.9039737955729166">
      <DataClassMoniker Name="/DB/ATENCION" />
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    <classShape Id="f479daef-94e3-451a-b060-f4644304ec8c" absoluteBounds="0.5, 0.5, 2, 2.4109318033854166">
      <DataClassMoniker Name="/DB/MEDICOEXTERNO" />
      <nestedChildShapes>
        <elementListCompartment Id="964d649c-c39e-48c6-b130-215c40080462" absoluteBounds="0.515, 0.96, 1.9700000000000002, 1.8509318033854165" name="DataPropertiesCompartment" titleTextColor="Black" itemTextColor="Black" />
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      <nodes>
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        <classShapeMoniker Id="8a332fc0-58f9-4d58-ae99-d84b9ef09d01" />
      </nodes>
    </associationConnector>
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</ordesignerObjectsDiagram>
XML:ohooh:）
看起来您的数据库架构与DBML不匹配。仔细检查您的属性类型和属性是否匹配。

您的
示例中的
estadoStudio
字段是否为表a VarChar（1）？如果LINQ to SQL设计器已将其解释为Char字段，请将DBML设计器中的列或底层XML编辑为
System.String
，而不是
System.Char
。如果您在LINQ to SQL中表示的任何其他VarChar（1）字段可以为空，因为您不能有空字符，我也建议您使用该字段。
解决方案：

打开一个新项目，添加新的Linq2SQL模型，然后复制并粘贴XML和designer.cs文件，在此行重命名：


public DB() :
            base(global::SRIMedico.Properties.Settings.Default.DATABASEGENERALConnectionString, mappingSource)
        {
            OnCreated();
        }


其中SRIMedico将是您的默认命名空间。。。
DATABASEGENERALConnectionString将是您的ConnectionString名称


希望对您有所帮助
您能为INFORMEMEDICO表发布从DBML生成的XML吗？我最近遇到了类似的情况。您的一个外键不是关联表中的主键吗？我只是从服务器explorerwell拖放，用同一个WPF应用程序打开一个新项目，然后用一个按钮从数据库中更新表中的随机行，然后工作！这是一个bug吗？那么您只需要打开DBML设计器，单击数据库中定义为varchar（1）或nvarchar（1）的列，并将属性窗口中的类型从System.Char更改为System.StringBleh。。我应该更仔细地阅读你的错误消息。它说int32是字符串。你能用鼠标右键单击你的DBML并说“打开并选择XML查看器”，然后粘贴相关表的XML以及SQL定义，这样我们就可以看到不匹配的地方了吗？好的，也许这是一个错误，我在两个项目中都有相同的XML（在工作和不工作的项目中），我不能确认或否认这是一个错误，但我看不出有什么问题。希望您能将您的元素保存到正确工作的新项目中。

<?xml version="1.0" encoding="utf-8"?>
<Database Name="DATABASEGENERAL" EntityNamespace="Demo.View.Data" ContextNamespace="Demo.View" Class="DB" xmlns="http://schemas.microsoft.com/linqtosql/dbml/2007">
  <Connection Mode="AppSettings" ConnectionString="Data Source=192.168.0.3;Initial Catalog=DATABASEGENERAL;Integrated Security=True" SettingsObjectName="SRIMedico.Properties.Settings" SettingsPropertyName="DATABASEGENERALConnectionString1" Provider="System.Data.SqlClient" />
  <Table Name="dbo.EXAMENXATENCION" Member="EXAMENXATENCIONs">
    <Type Name="EXAMENXATENCION">
      <Column Name="codigo" Type="System.Int32" DbType="Int NOT NULL IDENTITY" IsPrimaryKey="true" IsDbGenerated="true" CanBeNull="false" />
      <Column Name="numeroatencion" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigopaciente" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="numerocita" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigocompaniaseguro" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="ruc" Type="System.String" DbType="Char(11) NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigoequipo" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="horaatencion" Type="System.DateTime" DbType="DateTime NOT NULL" CanBeNull="false" />
      <Column Name="codigoestudio" Type="System.String" DbType="Char(12) NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigoclase" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigomodalidad" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigounidad" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="estadoestudio" Type="System.Char" DbType="Char(1) NOT NULL" CanBeNull="false" />
      <Column Name="prioridad" Type="System.String" DbType="VarChar(20) NOT NULL" CanBeNull="false" />
      <Column Name="turnomedico" Type="System.String" DbType="Char(5)" CanBeNull="true" />
      <Association Name="ATENCION_EXAMENXATENCION" Member="ATENCION" ThisKey="numeroatencion,codigopaciente,codigomodalidad,codigounidad,codigocompaniaseguro,ruc,numerocita" OtherKey="numeroatencion,codigopaciente,codigomodalidad,codigounidad,codigocompaniaseguro,ruc,numerocita" Type="ATENCION" IsForeignKey="true" />
      <Association Name="EQUIPO_EXAMENXATENCION" Member="EQUIPO" ThisKey="codigoequipo" OtherKey="codigoequipo" Type="EQUIPO" IsForeignKey="true" />
      <Association Name="ESTUDIO_EXAMENXATENCION" Member="ESTUDIO" ThisKey="codigoestudio,codigoclase" OtherKey="codigoestudio,codigoclase" Type="ESTUDIO" IsForeignKey="true" />
    </Type>
  </Table>
  <Table Name="dbo.ATENCION" Member="ATENCIONs">
    <Type Name="ATENCION">
      <Column Name="fechayhora" Type="System.DateTime" DbType="DateTime NOT NULL" CanBeNull="false" />
      <Column Name="numeroatencion" Type="System.Int32" DbType="Int NOT NULL IDENTITY" IsPrimaryKey="true" IsDbGenerated="true" CanBeNull="false" />
      <Column Name="codigopaciente" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="cmp" Type="System.String" DbType="Char(6) NOT NULL" CanBeNull="false" />
      <Column Name="codigocompaniaseguro" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="ruc" Type="System.String" DbType="Char(11) NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="numerocita" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigomodalidad" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigounidad" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="peso" Type="System.Int32" DbType="Int NOT NULL" CanBeNull="false" />
      <Column Name="talla" Type="System.Single" DbType="Real NOT NULL" CanBeNull="false" />
      <Column Name="edad" Type="System.Int32" DbType="Int NOT NULL" CanBeNull="false" />
      <Column Name="codigousuario" Type="System.String" DbType="VarChar(20) NOT NULL" CanBeNull="false" />
      <Association Name="ATENCION_EXAMENXATENCION" Member="EXAMENXATENCIONs" ThisKey="numeroatencion,codigopaciente,codigomodalidad,codigounidad,codigocompaniaseguro,ruc,numerocita" OtherKey="numeroatencion,codigopaciente,codigomodalidad,codigounidad,codigocompaniaseguro,ruc,numerocita" Type="EXAMENXATENCION" />
      <Association Name="PACIENTE_ATENCION" Member="PACIENTE" ThisKey="codigopaciente" OtherKey="codigopaciente" Type="PACIENTE" IsForeignKey="true" />
      <Association Name="MEDICOEXTERNO_ATENCION" Member="MEDICOEXTERNO" ThisKey="cmp" OtherKey="cmp" Type="MEDICOEXTERNO" IsForeignKey="true" />
    </Type>
  </Table>
  <Table Name="dbo.INFORMEMEDICO" Member="INFORMEMEDICOs">
    <Type Name="INFORMEMEDICO">
      <Column Name="numeroinforme" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigoestudio" Type="System.String" DbType="Char(12) NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="turnosocio" Type="System.String" DbType="Char(5) NOT NULL" CanBeNull="false" />
      <Column Name="fechainforme" Type="System.DateTime" DbType="DateTime NOT NULL" CanBeNull="false" />
      <Column Name="horainforme" Type="System.DateTime" DbType="DateTime NOT NULL" CanBeNull="false" />
      <Column Name="tecnica" Type="System.String" DbType="VarChar(3000) NOT NULL" CanBeNull="false" />
      <Column Name="hallazgo" Type="System.String" DbType="VarChar(5000) NOT NULL" CanBeNull="false" />
      <Column Name="conclusion" Type="System.String" DbType="VarChar(3000) NOT NULL" CanBeNull="false" />
      <Column Name="impreso" Type="System.Boolean" DbType="Bit NOT NULL" CanBeNull="false" />
      <Column Name="codigoclase" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigopaciente" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="medicoinforma" Type="System.String" DbType="Char(5) NOT NULL" CanBeNull="false" />
      <Column Name="firmados" Type="System.Data.Linq.Binary" DbType="Image" CanBeNull="true" UpdateCheck="Never" />
      <Column Name="firmauno" Type="System.Data.Linq.Binary" DbType="Image" CanBeNull="true" UpdateCheck="Never" />
      <Column Name="nombreinforme" Type="System.String" DbType="VarChar(150) NOT NULL" CanBeNull="false" />
      <Association Name="ESTUDIO_INFORMEMEDICO" Member="ESTUDIO" ThisKey="codigoestudio,codigoclase" OtherKey="codigoestudio,codigoclase" Type="ESTUDIO" IsForeignKey="true" />
      <Association Name="PACIENTE_INFORMEMEDICO" Member="PACIENTE" ThisKey="codigopaciente" OtherKey="codigopaciente" Type="PACIENTE" IsForeignKey="true" />
    </Type>
  </Table>
  <Table Name="dbo.EQUIPO" Member="EQUIPOs">
    <Type Name="EQUIPO">
      <Column Name="fechaadquirio" Type="System.DateTime" DbType="DateTime NOT NULL" CanBeNull="false" />
      <Column Name="intensidad" Type="System.Single" DbType="Real NOT NULL" CanBeNull="false" />
      <Column Name="modelo" Type="System.String" DbType="VarChar(40)" CanBeNull="true" />
      <Column Name="marca" Type="System.String" DbType="VarChar(40) NOT NULL" CanBeNull="false" />
      <Column Name="nombreequipo" Type="System.String" DbType="VarChar(35) NOT NULL" CanBeNull="false" />
      <Column Name="codigoequipo" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Association Name="EQUIPO_EXAMENXATENCION" Member="EXAMENXATENCIONs" ThisKey="codigoequipo" OtherKey="codigoequipo" Type="EXAMENXATENCION" />
    </Type>
  </Table>
  <Table Name="dbo.ESTUDIO" Member="ESTUDIOs">
    <Type Name="ESTUDIO">
      <Column Name="nombreestudio" Type="System.String" DbType="VarChar(100) NOT NULL" CanBeNull="false" />
      <Column Name="codigoestudio" Type="System.String" DbType="Char(12) NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigoclase" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="indicacion" Type="System.String" DbType="VarChar(500)" CanBeNull="true" />
      <Association Name="ESTUDIO_EXAMENXATENCION" Member="EXAMENXATENCIONs" ThisKey="codigoestudio,codigoclase" OtherKey="codigoestudio,codigoclase" Type="EXAMENXATENCION" />
      <Association Name="ESTUDIO_INFORMEMEDICO" Member="INFORMEMEDICOs" ThisKey="codigoestudio,codigoclase" OtherKey="codigoestudio,codigoclase" Type="INFORMEMEDICO" />
    </Type>
  </Table>
  <Table Name="dbo.PACIENTE" Member="PACIENTEs">
    <Type Name="PACIENTE">
      <Column Name="nacionalidad" Type="System.String" DbType="VarChar(20) NOT NULL" CanBeNull="false" />
      <Column Name="direccion" Type="System.String" DbType="VarChar(80)" CanBeNull="true" />
      <Column Name="email" Type="System.String" DbType="VarChar(60)" CanBeNull="true" />
      <Column Name="celular" Type="System.String" DbType="VarChar(20)" CanBeNull="true" />
      <Column Name="telefono" Type="System.String" DbType="VarChar(20) NOT NULL" CanBeNull="false" />
      <Column Name="fechanace" Type="System.DateTime" DbType="DateTime NOT NULL" CanBeNull="false" />
      <Column Name="sexo" Type="System.Char" DbType="Char(1) NOT NULL" CanBeNull="false" />
      <Column Name="nombres" Type="System.String" DbType="VarChar(35) NOT NULL" CanBeNull="false" />
      <Column Name="apellidos" Type="System.String" DbType="VarChar(45) NOT NULL" CanBeNull="false" />
      <Column Name="dni" Type="System.String" DbType="VarChar(20)" CanBeNull="true" />
      <Column Name="codigopaciente" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Association Name="PACIENTE_ATENCION" Member="ATENCIONs" ThisKey="codigopaciente" OtherKey="codigopaciente" Type="ATENCION" />
      <Association Name="PACIENTE_INFORMEMEDICO" Member="INFORMEMEDICOs" ThisKey="codigopaciente" OtherKey="codigopaciente" Type="INFORMEMEDICO" />
    </Type>
  </Table>
  <Table Name="dbo.MEDICOEXTERNO" Member="MEDICOEXTERNOs">
    <Type Name="MEDICOEXTERNO">
      <Column Name="cmp" Type="System.String" DbType="Char(6) NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="apellidos" Type="System.String" DbType="VarChar(45) NOT NULL" CanBeNull="false" />
      <Column Name="nombres" Type="System.String" DbType="VarChar(35) NOT NULL" CanBeNull="false" />
      <Column Name="telefono" Type="System.String" DbType="VarChar(20)" CanBeNull="true" />
      <Column Name="direccion" Type="System.String" DbType="VarChar(80)" CanBeNull="true" />
      <Column Name="email" Type="System.String" DbType="VarChar(60)" CanBeNull="true" />
      <Column Name="fechanacio" Type="System.DateTime" DbType="DateTime" CanBeNull="true" />
      <Column Name="codigoespecialidad" Type="System.Int32" DbType="Int" CanBeNull="true" />
      <Column Name="activo" Type="System.Boolean" DbType="Bit NOT NULL" CanBeNull="false" />
      <Column Name="celular" Type="System.String" DbType="VarChar(20)" CanBeNull="true" />
      <Association Name="MEDICOEXTERNO_ATENCION" Member="ATENCIONs" ThisKey="cmp" OtherKey="cmp" Type="ATENCION" />
    </Type>
  </Table>
  <Table Name="dbo.PLANTILLA" Member="PLANTILLAs">
    <Type Name="PLANTILLA">
      <Column Name="codigoplantilla" Type="System.Int32" DbType="Int NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="codigoequipo" Type="System.Int32" DbType="Int NOT NULL" CanBeNull="false" />
      <Column Name="codigoestudio" Type="System.String" DbType="Char(12) NOT NULL" CanBeNull="false" />
      <Column Name="tituloplantilla" Type="System.String" DbType="VarChar(150) NOT NULL" CanBeNull="false" />
      <Column Name="tecnica" Type="System.String" DbType="VarChar(3000) NOT NULL" CanBeNull="false" />
      <Column Name="hallazgo" Type="System.String" DbType="VarChar(5000) NOT NULL" CanBeNull="false" />
      <Column Name="conclusion" Type="System.String" DbType="VarChar(3000) NOT NULL" CanBeNull="false" />
    </Type>
  </Table>
  <Table Name="dbo.FIRMA" Member="FIRMAs">
    <Type Name="FIRMA">
      <Column Name="codigofirma" Type="System.String" DbType="VarChar(20) NOT NULL" IsPrimaryKey="true" CanBeNull="false" />
      <Column Name="siglas" Type="System.String" DbType="Char(5) NOT NULL" CanBeNull="false" />
      <Column Name="imagen" Type="System.Data.Linq.Binary" DbType="Image NOT NULL" CanBeNull="false" UpdateCheck="Never" />
    </Type>
  </Table>
</Database>



public DB() :
            base(global::SRIMedico.Properties.Settings.Default.DATABASEGENERALConnectionString, mappingSource)
        {
            OnCreated();
        }