我有两个课程。
A类：
public class A {
prop string p1 { get; set; }
prop string p2 { get; set; }
prop string p3 { get; set; }
}
B类：
public class B {
prop string p1 { get; set; }
prop string p3 { get; set; }
}
现在假设我们有一个来自类B的对象，我们希望将它分配给类A中的对象。
B b_obj = new B(){
p1 = "something",
p2 = "something else"
}
A a_obj = new A(){
p1 = b_obj.p1,
p3 = b_obj.p3,
}
我认为上述解决方案不是最佳方式。
最佳做法将b_obj分配给班级A中的其他对象是什么？
提示：
中都有类似的属性class B中的所有媒体资源在class A
答案 0 :(得分：3)
您始终可以实现隐式或显式强制转换运算符：
public class B
{
public static explicit operator A(B b)
{
return new A() {
p1 = b_obj.p1,
p3 = b_obj.p3,
}
}
//...
}
现在，您只需在A B var a = (A)b;
A时编写即可。
B如果您无法访问public static A ToA(this B b)
{
return ...
}
或var a = b.ToA();
，则可以实施扩展方法：
java.lang.IllegalStateException: Can't find method acknowledge with 0 parameters in com.vaadin.shared.ui.ui.UIServerRpc
at com.vaadin.server.ServerRpcMethodInvocation.findInvocationMethod(ServerRpcMethodInvocation.java:84) ~[vaadin-server-7.7.7.jar:?]
at com.vaadin.server.ServerRpcMethodInvocation.<init>(ServerRpcMethodInvocation.java:42) ~[vaadin-server-7.7.7.jar:?]
at com.vaadin.server.communication.ServerRpcHandler.parseServerRpcInvocation(ServerRpcHandler.java:590) ~[vaadin-server-7.7.7.jar:7.7.7]
at com.vaadin.server.communication.ServerRpcHandler.parseInvocation(ServerRpcHandler.java:534) ~[vaadin-server-7.7.7.jar:7.7.7]
at com.vaadin.server.communication.ServerRpcHandler.parseInvocations(ServerRpcHandler.java:500) ~[vaadin-server-7.7.7.jar:7.7.7]
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:336) ~[vaadin-server-7.7.7.jar:7.7.7]
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:273) ~[vaadin-server-7.7.7.jar:7.7.7]
at com.vaadin.server.communication.PushHandler$2.run(PushHandler.java:148) ~[vaadin-server-7.7.7.jar:7.7.7]
at com.vaadin.server.communication.PushHandler.callWithUi(PushHandler.java:240) [vaadin-server-7.7.7.jar:7.7.7]
at com.vaadin.server.communication.PushHandler.onMessage(PushHandler.java:494) [vaadin-server-7.7.7.jar:7.7.7]
at com.vaadin.server.communication.PushAtmosphereHandler.onMessage(PushAtmosphereHandler.java:87) [vaadin-server-7.7.7.jar:7.7.7]
at com.vaadin.server.communication.PushAtmosphereHandler.onRequest(PushAtmosphereHandler.java:77) [vaadin-server-7.7.7.jar:7.7.7]
at org.atmosphere.cpr.AsynchronousProcessor.action(AsynchronousProcessor.java:199) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.cpr.AsynchronousProcessor.suspended(AsynchronousProcessor.java:107) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.container.Servlet30CometSupport.service(Servlet30CometSupport.java:66) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:2075) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatch(DefaultWebSocketProcessor.java:571) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.websocket.DefaultWebSocketProcessor$3.run(DefaultWebSocketProcessor.java:333) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.util.VoidExecutorService.execute(VoidExecutorService.java:101) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatch(DefaultWebSocketProcessor.java:328) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.websocket.DefaultWebSocketProcessor.invokeWebSocketProtocol(DefaultWebSocketProcessor.java:425) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.container.JSR356Endpoint$1.onMessage(JSR356Endpoint.java:214) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.atmosphere.container.JSR356Endpoint$1.onMessage(JSR356Endpoint.java:211) [atmosphere-runtime-2.2.9.vaadin2.jar:2.2.9.vaadin2]
at org.apache.tomcat.websocket.WsFrameBase.sendMessageText(WsFrameBase.java:393) [tomcat-websocket.jar:8.0.24]
at org.apache.tomcat.websocket.WsFrameBase.processDataText(WsFrameBase.java:494) [tomcat-websocket.jar:8.0.24]
at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:289) [tomcat-websocket.jar:8.0.24]
at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:130) [tomcat-websocket.jar:8.0.24]
at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:60) [tomcat-websocket.jar:8.0.24]
at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:203) [tomcat-websocket.jar:8.0.24]
at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(AbstractServletInputStream.java:198) [tomcat-coyote.jar:8.0.24]
at org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:96) [tomcat-coyote.jar:8.0.24]
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:663) [tomcat-coyote.jar:8.0.24]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1527) [tomcat-coyote.jar:8.0.24]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1484) [tomcat-coyote.jar:8.0.24]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_66]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_66]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.24]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_66]
使用方法类似：
@NoLoadingIndicator
public void acknowledge();
答案 1 :(得分：2)
您可以使用automapper http://automapper.org/ 然后你可以像这样使用它：
AutoMapper.Mapper.CreateMap<A, B>();
var a = ...
var model = AutoMapper.Mapper.Map<B>(a);
答案 2 :(得分：1)
您可以使用AutoMapper（请参阅denisv的回答），它根据名称提供类之间的映射。然后，您可以根据需要自定义映射。
您还可以编写一些扩展方法：
Imports System.Data.SqlClient
Imports System.IO
Imports Microsoft.Office.Interop.Excel
Imports Microsoft.Office.Interop
Imports System.Runtime.InteropServices
Imports System.Text.RegularExpressions
Public Class Form1
Public Property gridResults As Object
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
OpenFileDialog2.Title = "Velg fil ..."
OpenFileDialog2.InitialDirectory = "C:users\<currentuser>\Documents"
OpenFileDialog2.Filter = "Alle filer|*.*|Excel 2003|*.xls|Excel|*.xlsx"
OpenFileDialog2.FilterIndex = 2
OpenFileDialog2.ShowDialog()
End Sub
Private Sub OpenFileDialog2_FileOk(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles OpenFileDialog2.FileOk
Dim strm As System.IO.Stream
strm = OpenFileDialog2.OpenFile()
TextBox2.Text = OpenFileDialog2.FileName.ToString()
If Not (strm Is Nothing) Then
strm.Close()
End If
Me.Button5_Click(sender, e)
End Sub
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
If String.IsNullOrEmpty(TextBox2.Text) Then
MessageBox.Show("Klikk ""Bla gjennom"" for å velge en fil", "Ingen inndatafil")
Exit Sub
End If
Dim FilePath As String = OpenFileDialog2.FileName
Dim MyConnection As System.Data.OleDb.OleDbConnection
Dim DtSet As System.Data.DataSet
Dim MyCommand As System.Data.OleDb.OleDbDataAdapter
MyConnection = New System.Data.OleDb.OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & FilePath & ";Extended Properties=Excel 8.0;")
MyCommand = New System.Data.OleDb.OleDbDataAdapter("select * from [Sheet1$]", MyConnection)
MyCommand.TableMappings.Add("Table", "Net-informations.com")
DtSet = New System.Data.DataSet
MyCommand.Fill(DtSet)
DataGridView2.DataSource = DtSet.Tables(0)
MyConnection.Close()
End Sub
Public Function GetElementColorsValues(elementName As String) As Decimal()
Dim ULArray(4) As Decimal
Select Case elementName
Case "As (Arsen)"
ULArray(0) = 8
ULArray(1) = 20
ULArray(2) = 50
ULArray(3) = 600
ULArray(4) = 1000
Case "Cd (Kadmium)"
ULArray(0) = 1.5
ULArray(1) = 10
ULArray(2) = 15
ULArray(3) = 30
ULArray(4) = 1000
Case "Cu (Kopper)"
ULArray(0) = 100
ULArray(1) = 200
ULArray(2) = 1000
ULArray(3) = 8500
ULArray(4) = 25000
Case "Cr (Krom)"
ULArray(0) = 50
ULArray(1) = 200
ULArray(2) = 500
ULArray(3) = 2800
ULArray(4) = 25000
Case "Hg (Kvikksølv)"
ULArray(0) = 1
ULArray(1) = 2
ULArray(2) = 4
ULArray(3) = 10
ULArray(4) = 1000
Case "Ni (Nikkel)"
ULArray(0) = 60
ULArray(1) = 135
ULArray(2) = 200
ULArray(3) = 1200
ULArray(4) = 2500
Case "Pb (Bly)"
ULArray(0) = 60
ULArray(1) = 100
ULArray(2) = 300
ULArray(3) = 700
ULArray(4) = 2500
Case "Zn (Sink)"
ULArray(0) = 200
ULArray(1) = 500
ULArray(2) = 1000
ULArray(3) = 5000
ULArray(4) = 25000
End Select
Return ULArray
End Function
'Fargeleggingsrutine - gir feilmelding
Private Sub SetDGVColColor()
Dim ULArray As Decimal()
Dim curValue As String
Dim decimalValue As Decimal
Dim colName = ""
For col As Integer = 2 To DataGridView2.ColumnCount - 1
colName = DataGridView2.Columns(col).Name
ULArray = GetElementColorsValues(colName)
For Each row As DataGridViewRow In DataGridView2.Rows
If (Not row.IsNewRow) Then
curValue = row.Cells(colName).Value
If (curValue IsNot Nothing) Then
Decimal.TryParse(curValue, decimalValue)
' the above TryParse line will set decimalValue to 0 if curValue is not a valid decimal i.e `<0.005`
Select Case decimalValue
Case >= ULArray(4)
row.Cells(colName).Style.BackColor = Color.BlueViolet
Case >= ULArray(3)
row.Cells(colName).Style.BackColor = Color.Red
Case >= ULArray(2)
row.Cells(colName).Style.BackColor = Color.Orange
Case >= ULArray(1)
row.Cells(colName).Style.BackColor = Color.Yellow
Case >= ULArray(0)
row.Cells(colName).Style.BackColor = Color.LawnGreen
Case Else
row.Cells(colName).Style.BackColor = Color.DodgerBlue
End Select
End If ' ignore empty cell
End If ' ignore the new row
Next
Next
End Sub
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
SetDGVColColor()
End Sub
'Første svar fra JohnG
'Fjerde forsøk på eksport
Private Sub ExportToExcel()
Dim excel As Microsoft.Office.Interop.Excel._Application = New Microsoft.Office.Interop.Excel.Application()
Dim workbook As Microsoft.Office.Interop.Excel._Workbook = excel.Workbooks.Add(Type.Missing)
Dim worksheet As Microsoft.Office.Interop.Excel._Worksheet = Nothing
excel.Visible = True
Try
worksheet = workbook.ActiveSheet
worksheet.Name = "ExportedFromDataGrid"
Dim cellRowIndex As Integer = 1
Dim cellColumnIndex As Integer = 1
'gets header rows.
For Each column In DataGridView2.Columns
worksheet.Cells(1, column.Index + 1).Value = column.Name
Next
'gets all other rows
Dim rowIndex = 2
For Each row As DataGridViewRow In DataGridView2.Rows
If Not row.IsNewRow Then
For colIndex As Integer = 0 To DataGridView2.Columns.Count - 1
worksheet.Cells(rowIndex, colIndex + 1).Value = row.Cells(colIndex).Value.ToString
Next
End If
rowIndex += 1
Next
' Substituted code below that loops through each column with data
' then sets the color for each of those columns by calling the SetColColor method
For index As Integer = 2 To DataGridView2.Columns.Count
Dim colName = DataGridView2.Columns(index).Name
SetExcelColColor(worksheet, colName, index + 1)
Next
MessageBox.Show("Closing excel: save if needed!")
'workbook.SaveAs("YourFileName..",)
workbook.Close()
excel.Quit()
Marshal.ReleaseComObject(worksheet)
Marshal.ReleaseComObject(workbook)
Marshal.ReleaseComObject(excel)
Catch
MessageBox.Show("Error")
End Try
End Sub
'andre eksportrutine med fargelegging fra JohnG
Private Sub SetExcelColColor(worksheet As Microsoft.Office.Interop.Excel._Worksheet, colName As String, colIndex As Integer)
Dim rIndex = 2
Dim cIndex = colIndex
Dim ULArray = GetElementColorsValues(colName)
Dim curValue As String
Dim decimalValue As Decimal
For Each row As DataGridViewRow In DataGridView2.Rows
If (Not row.IsNewRow) Then
curValue = row.Cells(colName).Value
If (curValue IsNot Nothing) Then
Decimal.TryParse(curValue, decimalValue)
Select Case decimalValue
Case >= ULArray(4)
worksheet.Cells(rIndex, cIndex).Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.BlueViolet)
Case >= ULArray(3)
worksheet.Cells(rIndex, cIndex).Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Red)
Case >= ULArray(2)
worksheet.Cells(rIndex, cIndex).Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Orange)
Case >= ULArray(1)
worksheet.Cells(rIndex, cIndex).Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Yellow)
Case >= ULArray(0)
worksheet.Cells(rIndex, cIndex).Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.LawnGreen)
Case Else
worksheet.Cells(rIndex, cIndex).Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.DodgerBlue)
End Select
rIndex += 1
End If ' ignore empty cell
End If ' ignore new row
Next
End Sub
Private Sub btnBrowse_Click(sender As Object, e As EventArgs) Handles btnBrowse.Click
Me.ExportToExcel()
End Sub
Private Sub Button7_Click(sender As Object, e As EventArgs) Handles Button7.Click
System.Windows.Forms.Application.Exit()
End Sub
End Class
答案 3 :(得分：-1)
首先初始化B类并设置值。然后创建这样一个类：
mysql> kill put_process_id_here;}
并将A和B类作为参数
传递给此类