我是c#和.NET的新手.我正在学习ASP.NET MVC 5.我发现自己花了额外的时间将模型转换为viewmodel.

这是我的模特

public class Overview
{

    public string chain_name { get; set; }
    public int store_id { get; set; }
    public int total_attempts { get; set; }
    public int total_unique_number_called { get; set;  }
    public int total_callable { get; set; }
    public int total_completed_interviews { get; set; }

}

这是我的视图模型

public class Overviewviewmodel
{

    public string chain_name { get; set; }
    public int store_id { get; set; }
    public int total_attempts { get; set; }
    public int total_unique_number_called { get; set; }
    public int total_callable { get; set; }
    public int total_completed_interviews { get; set; }
    public decimal? unique_number_per_complete { get; set; }

    public Overviewviewmodel()
    {
        unique_number_per_complete = 0;
    }

}

正如您所看到的,除了作为计算的over变量之外,Model和viewmodel都是相同的.

要填充我的视图模型,请执行以下操作

var records = conn.Database.sqlQuery<Overview>(query).ToList();

var overView = new List<Overviewviewmodel>();

foreach(var record in records){

    var newRecord = new Overviewviewmodel();

    newRecord.store_id = record.store_id;

    newRecord.chain_name = record.chain_name;

    newRecord.total_attempts = record.total_attempts;

    newRecord.total_callable = record.total_callable;

    newRecord.total_completed_interviews = record.total_completed_interviews;

    if (record.total_completed_interviews > 0) {
        newRecord.total_unique_number_called = record.total_unique_number_called / record.total_completed_interviews;
    }

    overView.Add(newRecord);
}

我用我的方法看到的两个问题是

>我必须做很多额外的编码,尤其是视图模型很大或者我有多个需要计算的变量.
>我觉得我正在循环一次额外的时间将我的模型转换为查看模式.

在c#中有更简单的方法吗？

对于大型应用程序,此程序是否有更好的方法？我的目标是学习更充分地利用我的代码时间的方法.

是的,您应该使用Automapper,安装包视图Nuget. Automapper也是非常可配置的.

http://automapper.org/

首先,创建这个类：

public static class AutoMapperConfig
{
    public static void RegisterMappings()
    {
        //Example here,creates "two way" for Overview & Overviewviewmodel mapping
        Mapper.CreateMap<Overview,Overviewviewmodel>(); //<source,destination>
        Mapper.CreateMap<Overviewviewmodel,Overview>(); //<source,destination>
        //..more mapping for other Models and viewmodels.
    }
}

在Global.asax.ApplicationStart()中添加以下行：

AutoMapperConfig.RegisterMappings()

现在你评论中的foreach示例很简单：

foreach (var record in records)
{
    var newRecordOverviewviewmodel = Mapper.Map<Overviewviewmodel>(record); //<destination>(source)
    overView.Add(newRecordOverviewviewmodel);
}

在delphi中将PDF转换为TBitmap图像的最简单方法是什么？
如果有任何商业可用的德尔福工具,我可以买一个如果它是可靠的或不昂贵的…

我正在考虑某种类型的查看器,我可以浏览页面..缩放…并以所需的分辨率导出..

我在 QuickPDF上取得了不错的成绩.它相对便宜,并且有试用版.

大家好我正在研究Objective-C.我以前的问题是 How can I edit PDF files in an iOS application?
经过大量的谷歌搜索后,我发现了以下内容.在UIWebView中显示pdf,使用C / javascript提取数据并进行编辑.我仍然不确定这个程序.现在我的计划是

1)显示pdf

2)当用户想要编辑pdf时,我将pdf转换为文本并允许他编辑它

3)试着保存将内容转换回pdf.

这是一种继续进行的方式吗？即时通讯步骤1.现在我如何转换pdf – >文字和文字 – > pdf.

提前致谢

当您将自定义文档类型(doc,ppt,pdf等)加载到UIWebView中时,webview将返回一个nil HTML字符串,即使是通过javascript也是如此.提取PDF文本 here有一些建议.

但将字符串转换回PDF是不同的.如果你想保留原始PDF的格式,我相信这是不可能的,因为iOS上的NSAttributedString并没有做太多.但是如果可能的话,这将适用于纯文本或NSAttributedString：

NSData *PDFDataFromString(Nsstring *str) {
    NSMutableData *data = [NSMutableData data];

    //Create an NSAttributedString for CoreText. If you find a way to translate
    //PDF into an NSAttributedString,you can skip this step and simply use an
    //NSAttributedString for this method's argument.

    NSAttributedString* string = [[[NSAttributedString alloc] initWithString:str] autorelease];

    //612 and 792 are the dimensions of the paper in pixels. (8.5" x 11")
    CGRect paperRect = CGRectMake(0.0,0.0,612,792);

    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef) string);
    CGSize requiredSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter,CFRangeMake(0,[string length]),NULL,CGSizeMake(paperRect.size.width - 144,1e40),NULL);

    //Subtract the top and bottom margins (72 and 72),so they aren't factored in page count calculations.
    NSUInteger pageCount = ceill(requiredSize.height / (paperRect.size.height - 144));
    CFIndex resumePageIndex = 0;
    UIGraphicsBeginPDFContextToData(data,paperRect,nil);

    for(NSUInteger i = 0; i < pageCount; i++) 
    {

    //After calculating the required number of pages,break up the string and
    //draw them into sequential pages.

        UIGraphicsBeginpdfpage();
        CGContextRef currentContext = UIGraphicsGetCurrentContext();
        CGContextSaveGState (currentContext);
        CGContextSetTextMatrix(currentContext,CGAffineTransformIdentity);
        CGMutablePathRef framePath = CGPathCreateMutable();

        //72 and 72 are the X and Y margins of the page in pixels.
        CGPathAddRect(framePath,CGRectInset(paperRect,72.0,72.0));

        CTFrameRef frameRef = CTFramesetterCreateFrame(framesetter,CFRangeMake(resumePageIndex,0),framePath,NULL);
        resumePageIndex += CTFrameGetVisibleStringRange(frameRef).length;
        CGPathRelease(framePath);
        CGContextTranslateCTM(currentContext,paperRect.size.height);
        CGContextScaleCTM(currentContext,1.0,-1.0);
        CTFrameDraw(frameRef,currentContext);
        CFRelease(frameRef);    
        CGContextRestoreGState (currentContext);
    }
    CFRelease(framesetter);
    UIGraphicsEndPDFContext();
    return data;
}