如何使用Linq Lambda表达式在标签上打印记录 [英] how to print record on label using Linq Lambda expression

问题描述

//我为Lambda表达式新推出并推出它

// i m new for for Lambda expression and lurning it

var getdata = dm.Cloths.Where(w => w.Cloth_No == txtvalue).Select(w => new { w.Cloth_Name, w.Cloth_Type });
           if (Enumerable.Count(getdata) > 0)
           {
               MessageBox.Show(????????);
// how can i print Cloth_Name and Cloth_Type in message box which  are in getdata  
           }

推荐答案

你想要制定一点不同的东西，而且你有一个错字。假设您要保留此方法的匿名对象列表将起作用::

You want to formulate that a bit differently, and you have a typo. Assuming that you want to keep the list of anonymous objects around this method will work::

var getdata = dm.Cloths.Where(w => w.Cloth_No == txtvalue).Select(w => new { w.Cloth_Name, w.Cloth_Type }).ToList();
           if (getdata.Any())
           {
               var sb = new StringBuilder();
               foreach(var item in getdata)
               {
                   sb.Append(item.Cloth_Name + " : " + item.Cloth_Type + "\n");
               }
               MessageBox.Show(sb.ToString()); 
           }

错误：更改此： Enumerable.Count（getdate）> 收件人：可枚举。计数（getdata）>



您可能还想执行使用Linq中的新建将其转换为可用列表的查询投影：



var getdata = dm.Cloths.Where（w => w.Cloth_No == txtvalue）。选择（w => new {w.Cloth_Name，w.Cloth_Type}）。ToList （）;



在if语句上放置一个断点，并且，当你的应用程序停在那里时：检查'getdata的内容：getdata中有什么内容可用可以在MessageBox中显示，必要时转换为String。



'dmCloths是一个类的集合？

Bug: change this: Enumerable.Count(getdate) > To: Enumerable.Count(getdata) >

You may also want to execute the query projection you build using 'new in Linq to transform it into a usable List:

var getdata = dm.Cloths.Where(w => w.Cloth_No == txtvalue).Select(w => new { w.Cloth_Name, w.Cloth_Type }).ToList();

Put a break-point on the if statement, and, when your application stops there: inspect the contents of 'getdata: whatever is available inside 'getdata is available for you to show in a MessageBox, converting to String if necessary.

'dmCloths is a collection of a Class ?

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