Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
323 views
in Technique[技术] by (71.8m points)

c# - Linq : select value in a datatable column

How do you use LINQ (C#) to select the value in a particular column for a particular row in a datatable. The equivalent SQL would be:

select NAME from TABLE where ID = 0

Thanks in advance.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Thanks for your answers. I didn't understand what type of object "MyTable" was (in your answers) and the following code gave me the error shown below.

DataTable dt = ds.Tables[0];
var name = from r in dt
           where r.ID == 0
           select r.Name;

Could not find an implementation of the query pattern for source type 'System.Data.DataTable'. 'Where' not found

So I continued my googling and found something that does work:

var rowColl = ds.Tables[0].AsEnumerable();
string name = (from r in rowColl
              where r.Field<int>("ID") == 0
              select r.Field<string>("NAME")).First<string>();

What do you think?


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...