切换嵌套的Foreach循环。如何走出某种条件。 [英] Switch inside nested Foreach loops. how to get out on certain condtion.

问题描述

你好，我有一种情况，我被困了



我有一个开关盒内置两个嵌套的每个循环。如果开关盒是真的，我想离开内循环。

Hello i have a situation where i am stuck

i have a switch case inside two nested for each loops. i want to get out of the inner loop if switch case is true.

foreach(DataRow dr in dt.Rows)
  {
      foreach (DataColumn dc in dt.Columns) 
       {
           switch (dc.Ordinal)
                  {
                     case 0:
                           {
                            if( string.IsNullOrEmpty(dr[dc].ToString()))
                               {
                                 continue;
                               }  
                           }
                   }
       }
  }

我需要做的是如果switch case为true，那么我需要输出DataColumn循环并转到dataRow循环。但是继续只是再次带我到dc循环。

What i need to do is if the switch case is true then i need to getout of the DataColumn loop and go to dataRow loop. But continue just takes me to dc loop again.

推荐答案

bool exitLoop;
foreach(DataRow dr in dt.Rows)
{
    foreach (DataColumn dc in dt.Columns)
     {
         switch (dc.Ordinal)
                {
                   case 0:
                         {
                          if( string.IsNullOrEmpty(dr[dc].ToString()))
                             {
                               exitLoop = true;
                               break;
                             }
                         }
                 }
           if (exitLoop) break;
           
     }
   
}

使用以下样本

Hi,

use below sample

bool isExists=false;
foreach(DataRow dr in dt.Rows)
  {
      foreach (DataColumn dc in dt.Columns)
       {
           switch (dc.Ordinal)
                  {
                     case 0:
                           {
                            if( string.IsNullOrEmpty(dr[dc].ToString()))
                               {
                                   isExists=true;
                                   break;
                               }
                           }
                   }
       }
  }

继续，声明将继续下一个声明，而不是更好地使用break;它会打破当前循环并为您提供结果集。

Continue, statement will continue the next statement, instead of that better to use break; it's breaks the current looping and give you the result set.

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