小编use*_*618的帖子

我有2个班:

公共课ClassA

公共类ClassB(来自另一个名称空间):ClassA

我在ClassA使用方法

public static ClassA Deserialize(string path)
{
ClassA classA;

//classA=code...

return classA;
}

我在classB调用这个方法

public void DoSomething()
{
ClassB classB=(ClassB)ClassA.Deserialize("c:\directory\file.xml);
}

方法反序列化工作,但我得到错误,勇士将ClassA强制转换为ClassB.

怎么处理这个？

 public static ClassA DeserializeFromXml(string path)
        {

 XmlSerializer s = new XmlSerializer(typeof(ClassA));
            ClaasA h;

            TextReader r = new StreamReader(path);


                h = (ClassA)s.Deserialize(r);

                r.Close();

                return h;
}

也许有反序列化的东西(字符串路径,类型objectType)??

如果有必要,我可以更改方法反序列化

我正在通过以下方法调整jpeg 1200x900,556kb的大小:

public static Image ResizeImage(Image imgToResize, int height) //height=400
{
    int destWidth;
    int destHeight;

    int sourceWidth = imgToResize.Width;
    int sourceHeight = imgToResize.Height;

    float nPercent = 0;

    float nPercentH = 0;


    nPercentH = ((float)height / (float)sourceHeight);


    nPercent = nPercentH;


    destWidth = (int)(sourceWidth * nPercent);
    destHeight = height;

    Bitmap b = new Bitmap(destWidth, destHeight);
    Graphics g = Graphics.FromImage((Image)b);
    g.InterpolationMode = InterpolationMode.HighQualityBicubic;

    g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
    g.Dispose();
    return b;
}

保存？

Image image = Image.FromStream(new FileStream(path, FileMode.Open));
Image imageAfterResizing =ResizeImage(image,400);
imageAfterResizing.Save(@"c:\myPhoto.jpg"); …

我有一个类Flight,我正在尝试初始化它,但我有一个语法错误

print x=Flight(flightFromInput='nebrasca')

这是我的示例文件的内容

class Flight:
    flightFrom = None
    flightTo = None
    departureDate = None
    arrivalDate=None
    airline=None
    serviceClass=None
    departureAirport = None
    arrivalAirport=None


    #----------------------------------------------------------------------
    def __init__(self,flightFromInput):
        self.flightFrom = flightFromInput

print x=Flight(flightFromInput='nebrasca')

这段代码有什么问题？

我创建了一个对象的字典(信用卡):

class CreditCard:

    def __init__(self,number,expire_date_month,expire_date_year,CVC):
        self.number=number
        self.expire_date_month=expire_date_month
        self.expire_date_year=expire_date_year
        self.CVC=CVC

credit_cards={CreditCard('1000000000000000','3','2011','111'):'VISA'}
credit_cards_frozen=frozenset({CreditCard('1000000000000000','3','2011','111'):'VISA'})

但执行这些命令时出错:

print credit_cards['VISA'] #KeyError: 'VISA'
print credit_cards_frozen['VISA'] #TypeError: 'frozenset' object is not subscriptable

我的代码出了什么问题？

我有表行:

ID          CountryCode Status
----------- ----------- -----------
2           PL          1
3           PL          2
4           EN          1
5           EN          1

并通过查询

    SELECT [CountryCode]
      ,MAX([Status])
  FROM [TestTable]
  GROUP BY CountryCode,Status

我想得到:

CountryCode Status
----------- -----------
PL          2
EN          1

但我得到:

CountryCode Status
----------- -----------
EN          1
PL          1
PL          2

这个查询有什么问题？

最好的祝福

编辑

好吧,Thanx for manz答案,但我没有添加部分查询,这是:

Having Status != 3

所以我认为我必须在组中使用Status:/

用于创建和填充表格的脚本:

USE [DatabaseName]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TestTable](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [CountryCode] …

我有一个方法

 Public Property ConfigKeys(ByVal keyName As String) As WinItUtils.Classes.ConfigKey
            Get
                Return GetConfigKey(keyName)
            End Get
            Set(ByVal value As WinItUtils.Classes.ConfigKey)
                SetConfigKey(value)
            End Set
        End Property

和转换器http://www.developerfusion.com/tools/convert/vb-to-csharp/给了我

public WinItUtils.Classes.ConfigKey ConfigKeys
        {
            get { return GetConfigKey(keyName); }
            set { SetConfigKey(value); }
        }

这是胡说八道.或许这是我不知道的事情:/我是视觉基础的新手,所以也许我错过了我正在使用的东西.net 4.0

这是ConfigKey类:

Namespace Classes

    ''' <summary>
    ''' Business class that implements a configuration key from WINIT_CONFIG table.
    ''' </summary>
    ''' <remarks></remarks>
    Public Class ConfigKey
        Implements IEquatable(Of ConfigKey)

        Private _resourceKey As String

        Private _value As String

        Private _id As Integer …