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我对 linq 实体框架有疑问。所以我有一个.dbml名为

CustomerLicensesInstallation.dbml

在这个文件中，我有 4 个 mssql db 表。

我的 表和他们 的 关系 如下
表
1. PrescribingUnit
2. Customers
3.Licenses和
4. Installations


relasoships
CustomersPrescribingUnitOne To Many 1-N
CustomersLicensesOne To Many 1-N
LicensesInstallationsOne To One 1-1


我如何尝试使用 asp.net 和 C# 在 gridview 中显示这些数据。
我想PrescribingUnit用它们显示表的所有数据customers，Licenses
我正在使用 LinqDataSource，当试图用Eval它显示时什么也没显示。
我正在使用下面的代码作为GridView.

<asp:TemplateField HeaderText="Serial Number" >
      <ItemTemplate>
       <asp:Label ID="LabelLicenseSerialNumber" runat="server" Text='<%# Eval("licenses.license_serial_number") %>'>
        </asp:Label>
      </ItemTemplate>
  </asp:TemplateField>

<asp:TemplateField HeaderText="Customer Name" >
          <ItemTemplate>
           <asp:Label ID="LabelCustomerFullName" runat="server" Text='<%# Eval("customers.full_name") %>'>
            </asp:Label>
          </ItemTemplate>
      </asp:TemplateField>

<asp:TemplateField HeaderText="Prescribing Unit" >
              <ItemTemplate>
               <asp:Label ID="LabelPrescribingUnit" runat="server" Text='<%# Eval("prescribingunit.unit") %>'>
                </asp:Label>
              </ItemTemplate>
          </asp:TemplateField>

GridView 数据源是

<asp:GridView ID="GridViewSerials" runat="server" CellPadding="4" 
            ForeColor="#333333" Width="100%" BorderStyle="Solid" BorderWidth="1px" 
            CellSpacing="2" ShowHeaderWhenEmpty="True" 
            ShowFooter="True"
            EmptyDataText="No Log Messages" DataSourceID="LinqDataSource1" 
            AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" 
            DataKeyNames="license_id" 
            PageSize="50" 
            DataMember="DefaultView">

而 asp:LinqDataSource 是 

<asp:LinqDataSource ID="LinqDataSource1" runat="server" TableName="licenses" 
                ContextTypeName="ActivationWebService.LinqToSqlClasses.CustomerLicensesInstallationDataContext" 
                EntityTypeName="">
            </asp:LinqDataSource>

并且CustomerLicensesInstallationDataContext是自动生成的代码

#pragma warning disable 1591
//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//     Runtime Version:4.0.30319.18051
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace ActivationWebService.LinqToSqlClasses
{


    public partial class license : INotifyPropertyChanging, INotifyPropertyChanged
{

    private static PropertyChangingEventArgs emptyChangingEventArgs = new PropertyChangingEventArgs(String.Empty);

    private long _id;

    private System.DateTime _issue_date;

    private System.DateTime _expiration_date;

    private System.DateTime _installation_date;

    private string _serial_number;

    private int _number_of_installations;

    private bool _is_active;

    private long _id_customers;

    private long _id_editions;

    private EntityRef<installations> _installations;

    private EntityRef<customers> _customer;

#region Extensibility Method Definitions

#endregion

    public license()
    {
        this._installations = default(EntityRef<installations>);
        this._customer = default(EntityRef<customers>);
        OnCreated();
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Name="id", Storage="_id", AutoSync=AutoSync.OnInsert, DbType="BigInt NOT NULL IDENTITY", IsPrimaryKey=true, IsDbGenerated=true)]
    public long license_id
    {
        get
        {
            return this._id;
        }
        set
        {
            if ((this._id != value))
            {
                this.Onlicense_idChanging(value);
                this.SendPropertyChanging();
                this._id = value;
                this.SendPropertyChanged("license_id");
                this.Onlicense_idChanged();
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Name="issue_date", Storage="_issue_date", DbType="Date NOT NULL")]
    public System.DateTime license_issue_date
    {
        get
        {
            return this._issue_date;
        }
        set
        {
            if ((this._issue_date != value))
            {
                this.Onlicense_issue_dateChanging(value);
                this.SendPropertyChanging();
                this._issue_date = value;
                this.SendPropertyChanged("license_issue_date");
                this.Onlicense_issue_dateChanged();
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Name="expiration_date", Storage="_expiration_date", DbType="Date NOT NULL")]
    public System.DateTime license_expiration_date
    {
        get
        {
            return this._expiration_date;
        }
        set
        {
            if ((this._expiration_date != value))
            {
                this.Onlicense_expiration_dateChanging(value);
                this.SendPropertyChanging();
                this._expiration_date = value;
                this.SendPropertyChanged("license_expiration_date");
                this.Onlicense_expiration_dateChanged();
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Name="installation_date", Storage="_installation_date", DbType="Date NOT NULL")]
    public System.DateTime license_installation_date
    {
        get
        {
            return this._installation_date;
        }
        set
        {
            if ((this._installation_date != value))
            {
                this.Onlicense_installation_dateChanging(value);
                this.SendPropertyChanging();
                this._installation_date = value;
                this.SendPropertyChanged("license_installation_date");
                this.Onlicense_installation_dateChanged();
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Name="serial_number", Storage="_serial_number", DbType="NVarChar(256) NOT NULL", CanBeNull=false)]
    public string license_serial_number
    {
        get
        {
            return this._serial_number;
        }
        set
        {
            if ((this._serial_number != value))
            {
                this.Onlicense_serial_numberChanging(value);
                this.SendPropertyChanging();
                this._serial_number = value;
                this.SendPropertyChanged("license_serial_number");
                this.Onlicense_serial_numberChanged();
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Name="number_of_installations", Storage="_number_of_installations", DbType="Int NOT NULL")]
    public int license_number_of_installations
    {
        get
        {
            return this._number_of_installations;
        }
        set
        {
            if ((this._number_of_installations != value))
            {
                this.Onlicense_number_of_installationsChanging(value);
                this.SendPropertyChanging();
                this._number_of_installations = value;
                this.SendPropertyChanged("license_number_of_installations");
                this.Onlicense_number_of_installationsChanged();
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Name="is_active", Storage="_is_active", DbType="Bit NOT NULL")]
    public bool license_is_active
    {
        get
        {
            return this._is_active;
        }
        set
        {
            if ((this._is_active != value))
            {
                this.Onlicense_is_activeChanging(value);
                this.SendPropertyChanging();
                this._is_active = value;
                this.SendPropertyChanged("license_is_active");
                this.Onlicense_is_activeChanged();
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Name="id_customers", Storage="_id_customers", DbType="BigInt NOT NULL")]
    public long license_id_customers
    {
        get
        {
            return this._id_customers;
        }
        set
        {
            if ((this._id_customers != value))
            {
                this.Onlicense_id_customersChanging(value);
                this.SendPropertyChanging();
                this._id_customers = value;
                this.SendPropertyChanged("license_id_customers");
                this.Onlicense_id_customersChanged();
            }
        }
    }

    [global::System.Data.Linq.Mapping.ColumnAttribute(Name="id_editions", Storage="_id_editions", DbType="BigInt NOT NULL")]
    public long license_id_editions
    {
        get
        {
            return this._id_editions;
        }
        set
        {
            if ((this._id_editions != value))
            {
                this.Onlicense_id_editionsChanging(value);
                this.SendPropertyChanging();
                this._id_editions = value;
                this.SendPropertyChanged("license_id_editions");
                this.Onlicense_id_editionsChanged();
            }
        }
    }

    [global::System.Data.Linq.Mapping.AssociationAttribute(Name="license_installations", Storage="_installations", ThisKey="license_id", OtherKey="installation_id_licenses", IsUnique=true, IsForeignKey=false)]
    public installations installations
    {
        get
        {
            return this._installations.Entity;
        }
        set
        {
            installations previousValue = this._installations.Entity;
            if (((previousValue != value) 
                        || (this._installations.HasLoadedOrAssignedValue == false)))
            {
                this.SendPropertyChanging();
                if ((previousValue != null))
                {
                    this._installations.Entity = null;
                    previousValue.license = null;
                }
                this._installations.Entity = value;
                if ((value != null))
                {
                    value.license = this;
                }
                this.SendPropertyChanged("installations");
            }
        }
    }

    [global::System.Data.Linq.Mapping.AssociationAttribute(Name="customers_license", Storage="_customer", ThisKey="license_id_customers", OtherKey="id", IsForeignKey=true)]
    public customers customers
    {
        get
        {
            return this._customer.Entity;
        }
        set
        {
            customers previousValue = this._customer.Entity;
            if (((previousValue != value) 
                        || (this._customer.HasLoadedOrAssignedValue == false)))
            {
                this.SendPropertyChanging();
                if ((previousValue != null))
                {
                    this._customer.Entity = null;
                    previousValue.licenses.Remove(this);
                }
                this._customer.Entity = value;
                if ((value != null))
                {
                    value.licenses.Add(this);
                    this._id_customers = value.id;
                }
                else
                {
                    this._id_customers = default(long);
                }
                this.SendPropertyChanged("customers");
            }
        }
    }

    public event PropertyChangingEventHandler PropertyChanging;

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void SendPropertyChanging()
    {
        if ((this.PropertyChanging != null))
        {
            this.PropertyChanging(this, emptyChangingEventArgs);
        }
    }

    protected virtual void SendPropertyChanged(String propertyName)
    {
        if ((this.PropertyChanged != null))
        {
            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}
}
#pragma warning restore 1591

我的问题是Eval("prescribingunit.unit")。
我可以显示该表中的数据。如果我将主表从 更改license为customer则它适用于表customers，prescribingunit但不适用于licenses.

为了修复它，我在我的数据库（msssql）中创建了一个视图，它现在工作正常。
但我会问你是否有其他解决方案来解决这些情况。

4

0 回答 0