如何将字符串实现为实际类型？
我正在创建一个类似的投影变量：
var projection = Builders<Items>.Projection
.Include(x => x.Name);
include方法采用表达式expression＆lt; func＆lt; tsource，object＆gt;＆gt;字段。
我想做的是将一个名为键的字符串参数转换为x.Name，能够动态地投影items的其他字段在运行时。
var key = "Name";
var projection = Builders<Items>.Projection
.Include(x => x."key");
I am creating a projection variable like this:
var projection = Builders<Items>.Projection
.Include(x => x.Name);
The Include method takes an expression Expression<Func<TSource,object>> field.
What I would like to do is to convert a string parameter named key for example to x.Name, to be able to dynamically project other fields of Items at runtime.
var key = "Name";
var projection = Builders<Items>.Projection
.Include(x => x."key");
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如评论作为将来参考的书面答案，您可以应用
String值，即字段名称。从 <代码> projectDefinition＆lt; tdocument＆gt; .include＆lt; tdocument＆gt;（） ，它支持
fielddefinition类型的参数，哪个会从
String值中执行隐式铸件。As written this answer from the comment as the future reference, you can apply
Provide a
stringvalue which is the field name.As from
ProjectDefinition<TDocument>.Include<TDocument>(), it supports with the parameter ofFieldDefinitiontype,which
FieldDefinition<TDocument>would perform an implicit cast from thestringvalue.