Select 投影中的索引 [英] Index in the Select projection

问题描述

在执行以下操作时，我希望我的索引从大于 0 的数字计数开始:

I would like my index to start from a number count greater than 0 while doing something like this:

var dataSource = WebConfigurationHelper.GetSupportedDomainsString().Select((domain, index) => 
new { index , Name = domain });

所以我的输出变成:

index=2 domain=zombieland
index=3 domain=mydomain

可以吗?

推荐答案

可以在Select投影中进行调整:

You can adjust it in the Select projection:

var dataSource = WebConfigurationHelper.GetSupportedDomainsString()
     .Select((domain, index) =>  new { Index = index + 2, Name = domain });

我最初对 new { index + 2, Name = domain } 的建议不起作用的原因是 projection initializer(您只指定一个表达式，并让编译器推断名称)仅在表达式是简单名称"、成员访问"或基本访问"时才有效.

The reason my original suggestion of new { index + 2, Name = domain } wouldn't work is that a projection initializer (where you specify just an expression, and let the compiler infer the name) only works when the expression is a "simple name", a "member access" or a "base access".

这篇关于Select 投影中的索引的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！