{"id":31155,"date":"2023-01-19T18:48:36","date_gmt":"2023-01-19T13:18:36","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-read-a-csv-to-a-c-object-to-be-able-to-do-linq-query-on-it-closed\/"},"modified":"2023-01-19T18:48:36","modified_gmt":"2023-01-19T13:18:36","slug":"solved-read-a-csv-to-a-c-object-to-be-able-to-do-linq-query-on-it-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-read-a-csv-to-a-c-object-to-be-able-to-do-linq-query-on-it-closed\/","title":{"rendered":"[Solved] Read a CSV to a C# object to be able to do LINQ query on it [closed]"},"content":{"rendered":"

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This part is pretty easy because you’re able to run LINQ queries on IEnumerable<T><\/code> – in other words, anything that you can do a foreach<\/code> loop on is something that you can query. And there are a great many ways to do that.<\/p>\n

First, however, I’m assuming that you already know the schema for the data you want to process (i.e., you already know that Column 17 is a birthdate or something like that). If you do, you will be able to build a single C# data object very quickly that your LINQ queries can easily run on. If you don’t have one, your C# data object will probably be an associative array instead (such as a HashMap<\/code> with string<\/code> keys).<\/p>\n

If you have to run multiple queries on the data, you can simply read each line, one by one, and put it into a List<T><\/code> instance.<\/p>\n

But if you have to pass through the CSV data only once<\/em>, you can instead create an iterator method and only read out line by line:<\/p>\n

public IEnumerable<DataObject> ReadCSVFile(Stream input)\n{\n  StreamReader reader = new StreamReader(input);\n  string line;\n  while ((line = reader.ReadLine()) != null) \/\/ this sets and checks line at the same time\n  {\n    DataObject data = new DataObject();\n\n    \/\/ ... fill in the parameters of your data object here ...\n\n    \/\/ this will return the single data object,\n    \/\/ let your LINQ query process it, and then continue the loop\n    yield return data;\n  }\n  reader.Close();\n}\n<\/code><\/pre>\n
Then, when you do your LINQ query, you invoke the method, as in <\/p>\n
from data in ReadCSVFile(dataStream)\n<\/code><\/pre>\n<\/p><\/div>\n
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            <\/span> <\/p><\/div>\n<\/div>\n
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solved Read a CSV to a C# object to be able to do LINQ query on it [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] This part is pretty easy because you’re able to run LINQ queries on IEnumerable<T> – in other words, anything that you can do a foreach loop on is something that you can query. And there are a great many ways to do that. First, however, I’m assuming that you already know the schema for … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,483,578],"class_list":["post-31155","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-csv","tag-linq"],"yoast_head":"\n[Solved] Read a CSV to a C# object to be able to do LINQ query on it [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-read-a-csv-to-a-c-object-to-be-able-to-do-linq-query-on-it-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Read a CSV to a C# object to be able to do LINQ query on it [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This part is pretty easy because you’re able to run LINQ queries on IEnumerable<T> – in other words, anything that you can do a foreach loop on is something that you can query. 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