我正在尝试使用实体模型将多个SQL表显示到一个数据网格以及更新，创建和删除行。加入实体后，从表中获取实体模型对象时遇到了问题，因为现在实体的数据字段比它来自的原始模型对象更多。我希望解决方案位于某种ViewModel中，但是我很难弄清楚如何将对象从ViewModel中分离出来后再进行组合。我已经尝试解决这个问题好几天了，在这一点上，我希望我将不得不对我的代码进行一些认真的重新设计。任何提示将不胜感激。
这里是负载实体模型（与货物负载相关的负载，与负载无关）
public partial class Load
{
public int bol_num { get; set; }
public string pro_num { get; set; }
public string quote_num { get; set; }
public string ref_num { get; set; }
public Nullable<double> weight { get; set; }
public Nullable<int> pieces { get; set; }
public string commodity { get; set; }
public Nullable<double> mileage { get; set; }
public Nullable<decimal> carrier_rate { get; set; }
public Nullable<decimal> customer_rate { get; set; }
public Nullable<int> driver_id { get; set; }
public Nullable<int> dispatch_id { get; set; }
public Nullable<int> customer_id { get; set; }
public Nullable<int> broker_id { get; set; }
public Nullable<System.DateTime> pick_date { get; set; }
public Nullable<System.TimeSpan> pick_time { get; set; }
public Nullable<System.DateTime> drop_date { get; set; }
public Nullable<System.TimeSpan> drop_time { get; set; }
public Nullable<System.DateTime> last_updated_time { get; set; }
public string load_status { get; set; }
public Nullable<int> account_id { get; set; }
public virtual Account Account { get; set; }
//Constructors
public Load(
int bolInt,
string proString,
string quoteString,
string refString,
double weightDouble,
int piecesInt,
string commodityString,
double mileageDouble,
decimal carrier_rateDecimal,
decimal customer_rateDecimal,
int driver_idInt,
int dispatch_idInt,
int customer_idInt,
int broker_idInt,
DateTime pick_dateDateTime,
TimeSpan pick_timeTimeSpan,
DateTime drop_dateDateTime,
TimeSpan drop_timeTimeSpan,
DateTime last_updated_timeDateTime,
string load_statusString,
int account_idInt
)
{
bol_num = bolInt;
pro_num = proString;
quote_num = quoteString;
ref_num = refString;
weight = weightDouble;
pieces = piecesInt;
commodity = commodityString;
mileage = mileageDouble;
carrier_rate = carrier_rateDecimal;
customer_rate = customer_rateDecimal;
driver_id = driver_idInt;
dispatch_id = dispatch_idInt;
customer_id = customer_idInt;
broker_id = broker_idInt;
pick_date = pick_dateDateTime;
pick_time = pick_timeTimeSpan;
drop_date = drop_dateDateTime;
drop_time = drop_timeTimeSpan;
last_updated_time = last_updated_timeDateTime;
load_status = load_statusString;
account_id = account_idInt;
}
//Default
public Load()
{
}
}
}
这是联系人对象的实体模型
public partial class Contact
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public Contact()
{
this.Accounts = new HashSet<Account>();
this.Users = new HashSet<User>();
}
public int id { get; set; }
public string contact_name { get; set; }
public string contact_phone { get; set; }
public string contact_email { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<Account> Accounts { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<User> Users { get; set; }
}
这是处理添加新行和更新现有行的功能
//Update or Create Button
private void update_btn_Click(object sender, RoutedEventArgs e)
{
//Value Setting process
try
{
//Load model
Load loadModel = new Load();
//Get the load data from input fields
loadModel.bol_num = Convert.ToInt32(bol_txt.Text.Trim());
loadModel.load_status = loadStatus_cmbo.Text;
loadModel.pro_num = pro_txt.Text.Trim();
loadModel.quote_num = quote_txt.Text.Trim();
loadModel.ref_num = ref_txt.Text.Trim();
try
{
loadModel.weight = Convert.ToDouble(weight_txt.Text.Trim());
}
catch (System.FormatException ex){ MessageBox.Show(ex.Message, "Invalid Pieces Entry", MessageBoxButton.OK, MessageBoxImage.Error);}
try
{
loadModel.pieces = Convert.ToInt32(pieces_txt.Text.Trim());
}
catch(System.FormatException ex){MessageBox.Show(ex.Message, "Invalid Pieces Entry", MessageBoxButton.OK, MessageBoxImage.Error);}
loadModel.commodity = commodity_txt.Text.Trim();
loadModel.mileage = Convert.ToDouble(mileage_txt.Text.Trim());
loadModel.carrier_rate = Convert.ToDecimal(carrierRate_txt.Text.Trim());
loadModel.customer_rate = Convert.ToDecimal(customerRate_txt.Text.Trim());
//Pick Date & Time setter
loadModel.pick_date = pickDate_picker.SelectedDate.Value;
loadModel.pick_time = TimeSpanBuilder(pickAptTime_txt.Text);
//Drop Date & Time setter
loadModel.drop_date = dropDate_picker.SelectedDate.Value;
loadModel.drop_time = TimeSpanBuilder(dropAptTime_txt.Text);
loadModel.driver_id = Convert.ToInt32(driver_txt.Text.Trim());
loadModel.dispatch_id = Convert.ToInt32(dispatch_txt.Text.Trim());
loadModel.customer_id = Convert.ToInt32(customer_txt.Text.Trim());
loadModel.broker_id = Convert.ToInt32(broker_txt.Text.Trim());
//Last updated
loadModel.last_updated_time = DateTime.Now;
//Save the load to the database
using(HOTLOADDBEntities HOTLOADEntity = new HOTLOADDBEntities())
{
if(loadModel.bol_num == 0)//Insert
{
HOTLOADEntity.Loads.Add(loadModel);
Clear();
MessageBox.Show("Saved Succesfully");
}
else//Update
{
HOTLOADEntity.Entry(loadModel).State = EntityState.Modified;
Clear();
}
//Save the changes
HOTLOADEntity.SaveChanges();
Search();
}
}
//Entity Model Exception handler
catch (DbEntityValidationException dbEx)
{
foreach (var validationErrors in dbEx.EntityValidationErrors)
{
foreach (var validationError in validationErrors.ValidationErrors)
{
Trace.TraceInformation(
"Class: {0}, Property: {1}, Error: {2}",
validationErrors.Entry.Entity.GetType().FullName,
validationError.PropertyName,
validationError.ErrorMessage);
}
}
}
}
此功能是从DataGrid中选择对象的功能，由于我将联接功能添加到我的Search功能中，因此该功能现在不起作用。
private void LoadBoard_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
if (LoadBoard.SelectedIndex != -1)
{
//Load model
Load loadModel = (Load)LoadBoard.SelectedItem;
using (HOTLOADDBEntities HOTLOADEntity = new HOTLOADDBEntities())
{
loadModel = HOTLOADEntity.Loads.Where(x => x.bol_num == loadModel.bol_num).FirstOrDefault();
bol_txt.Text = loadModel.bol_num.ToString();
loadStatus_cmbo.SelectedIndex = ParseStatus(loadModel.load_status);
pro_txt.Text = loadModel.pro_num.ToString();
quote_txt.Text = loadModel.quote_num.ToString();
ref_txt.Text = loadModel.ref_num.ToString();
weight_txt.Text = loadModel.weight.ToString();
pieces_txt.Text = loadModel.pieces.ToString();
commodity_txt.Text = loadModel.commodity.ToString();
mileage_txt.Text = loadModel.mileage.ToString();
carrierRate_txt.Text = loadModel.carrier_rate.ToString();
customerRate_txt.Text = loadModel.customer_rate.ToString();
//Dates & Times
pickDate_picker.Text = loadModel.pick_date.ToString();
pickAptTime_txt.Text = TimeStringBuilder(loadModel.pick_time.Value);
dropDate_picker.Text = loadModel.drop_date.ToString();
dropAptTime_txt.Text = TimeStringBuilder(loadModel.drop_time.Value);
driver_txt.Text = loadModel.driver_id.ToString();
dispatch_txt.Text = loadModel.dispatch_id.ToString();
customer_txt.Text = loadModel.customer_id.ToString();
broker_txt.Text = loadModel.broker_id.ToString();
lastUpdated_lbl.Content = "Last Updated: " + loadModel.last_updated_time;
}
//Change Update/New button text
update_btn.Content = "Update Load";
//Enable copy & delete buttons
delete_btn.IsEnabled = true;
copy_btn.IsEnabled = true;
}
}
这是处理数据库查询的功能
private void Search()
{
HOTLOADEntity = new HOTLOADDBEntities();
//Timespan handling
TimeSpan pickTimeStart = TimeSpan.Zero;
TimeSpan pickTimeEnd = TimeSpan.Zero;
TimeSpan dropTimeStart = TimeSpan.Zero;
TimeSpan dropTimeEnd = TimeSpan.Zero;
try { pickTimeStart = TimeSpanBuilder(pickTimeStartSearch_txt.Text); }catch (System.Exception){//Ignore
}
try{ pickTimeEnd = TimeSpanBuilder(pickTimeEndSearch_txt.Text); }catch (System.Exception){//Ignore
}
try { dropTimeStart = TimeSpanBuilder(dropTimeStartSearch_txt.Text); }catch (System.Exception){//Ignore
}
try { dropTimeEnd = TimeSpanBuilder(dropTimeEndSearch_txt.Text); }catch (System.Exception){//Ignore
}
var matchedLoads = (
from loadsTable in HOTLOADEntity.Loads
join driversTable in HOTLOADEntity.Contacts on loadsTable.driver_id equals driversTable.id
/*
where
loadsTable.bol_num.ToString().Contains(bolSearch_txt.Text) &&
loadsTable.pro_num.ToString().Contains(proSearch_txt.Text) &&
loadsTable.quote_num.ToString().Contains(quoteSearch_txt.Text) &&
loadsTable.ref_num.ToString().Contains(refSearch_txt.Text) &&
//Pick Date search terms
((pickDateStart_dtpckr.SelectedDate == null || loadsTable.pick_date >= pickDateStart_dtpckr.SelectedDate) &&
(pickDateEnd_dtpckr.SelectedDate == null || loadsTable.pick_date <= pickDateEnd_dtpckr.SelectedDate)) &&
//Pick Time search terms
((pickTimeStartSearch_txt.Text == null || pickTimeStart == TimeSpan.Zero || loadsTable.pick_time.Value >= pickTimeStart) &&
(pickTimeEndSearch_txt.Text == null || pickTimeEnd == TimeSpan.Zero || loadsTable.pick_time.Value <= pickTimeEnd)) &&
//Drop Date Search terms
((dropDateStart_dtpckr.SelectedDate == null || loadsTable.drop_date >= dropDateStart_dtpckr.SelectedDate) &&
(dropDateEnd_dtpckr.SelectedDate == null || loadsTable.drop_date <= dropDateEnd_dtpckr.SelectedDate)) &&
//Drop Time search terms
((dropTimeStartSearch_txt.Text == null || dropTimeStart == TimeSpan.Zero || loadsTable.drop_time.Value >= dropTimeStart) &&
(dropTimeEndSearch_txt.Text == null || dropTimeEnd == TimeSpan.Zero || loadsTable.drop_time.Value <= dropTimeEnd))
*/
select new
{
bol_num = loadsTable.bol_num,
load_status = loadsTable.load_status,
pro_num = loadsTable.pro_num,
quote_num = loadsTable.quote_num,
ref_num = loadsTable.ref_num,
weight = loadsTable.weight,
pieces = loadsTable.pieces,
commodity = loadsTable.commodity,
mileage = loadsTable.mileage,
carrier_rate = loadsTable.carrier_rate,
customer_rate = loadsTable.customer_rate,
pick_date = loadsTable.pick_date,
pick_time = loadsTable.pick_time,
drop_date = loadsTable.drop_date,
drop_time = loadsTable.drop_time,
last_updated_time = loadsTable.last_updated_time,
driver_id = loadsTable.driver_id,
driver_name = driversTable.contact_name,
driver_phone = driversTable.contact_phone,
driver_email = driversTable.contact_email,
dispatch_id = loadsTable.dispatch_id,
customer_id = loadsTable.customer_id,
broker_id = loadsTable.broker_id,
account_id = loadsTable.account_id
}
).ToList();
LoadBoard.ItemsSource = matchedLoads;
}
不确定这是否相关，但这是与DataGrid相关的XAML
<DataGrid Name="LoadBoard" AutoGenerateColumns="False" AlternatingRowBackground="Cornsilk" Background="Ivory" IsReadOnly="True" MouseDoubleClick="LoadBoard_MouseDoubleClick">
<!--Datagrid Columns-->
<DataGrid.Columns>
<DataGridTextColumn x:Name="bolColumn" Header="BOL#" Binding="{Binding bol_num}"/>
<DataGridTextColumn x:Name="statusColumn" Header="Status" Binding="{Binding load_status}"/>
<DataGridTextColumn x:Name="proColumn" Header="Pro#" Binding="{Binding pro_num}"/>
<DataGridTextColumn x:Name="quoteColumn" Header="Quote#" Binding="{Binding quote_num}"/>
<DataGridTextColumn x:Name="refColumn" Header="Ref" Binding="{Binding ref_num}"/>
<DataGridTextColumn x:Name="weightColumn" Header="Weight" Binding="{Binding weight}"/>
<DataGridTextColumn x:Name="piecesColumn" Header="Pieces" Binding="{Binding pieces}"/>
<DataGridTextColumn x:Name="commodityColumn" Header="Commodity" Binding="{Binding commodity}"/>
<DataGridTextColumn x:Name="mileageColumn" Header="Mileage" Binding="{Binding mileage}"/>
<DataGridTextColumn x:Name="carrierColumn" Header="Carrier Rate" Binding="{Binding carrier_rate}"/>
<DataGridTextColumn x:Name="customerRateColumn" Header="Customer Rate" Binding="{Binding customer_rate}"/>
<DataGridTextColumn x:Name="pickDateColumn" Header="Pick Date" Binding="{Binding pick_date, StringFormat= \{0:MM/dd/yyyy\}}" />
<DataGridTextColumn x:Name="pickTimeColumn" Header="Pick Time" Binding="{Binding pick_time, StringFormat=hh\\:mm}" />
<DataGridTextColumn x:Name="dropDateColumn" Header="Drop Date" Binding="{Binding drop_date, StringFormat= \{0:MM/dd/yyyy\}}" />
<DataGridTextColumn x:Name="dropTimeColumn" Header="Drop Time" Binding="{Binding drop_time, StringFormat=hh\\:mm}" />
<DataGridTextColumn x:Name="lastUpdatedColumn" Header="Last Updated" Binding="{Binding last_updated_time}" />
<DataGridTextColumn x:Name="driverNameColumn" Header="Driver Name" Binding="{Binding driver_name}"/>
<DataGridTextColumn x:Name="driverPhoneColumn" Header="Driver Phone" Binding="{Binding driver_phone}"/>
<DataGridTextColumn x:Name="driverEmailColumn" Header="Driver Email" Binding="{Binding driver_email}"/>
<DataGridTextColumn x:Name="DispatchColumn" Header="Dispatch" Binding="{Binding dispatch_id}"/>
<DataGridTextColumn x:Name="CustomerColumn" Header="Customer" Binding="{Binding customer_id}"/>
<DataGridTextColumn x:Name="BrokerColumn" Header="Broker" Binding="{Binding broker_id}"/>
</DataGrid.Columns>
</DataGrid>