{"id":121,"date":"2013-03-26T17:00:49","date_gmt":"2013-03-26T22:00:49","guid":{"rendered":"http:\/\/homepages.uc.edu\/~yaozo\/wordpress\/?p=121"},"modified":"2013-03-26T17:00:49","modified_gmt":"2013-03-26T22:00:49","slug":"datatable-compute-method","status":"publish","type":"post","link":"https:\/\/zhuoyao.net\/index.php\/2013\/03\/26\/datatable-compute-method\/","title":{"rendered":"DataTable Compute Method"},"content":{"rendered":"
<\/div>\n\n\n\n\n
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Compute is one of the methods of DataTable class. This method computes an expression on the current rows that pass the filter criteria.<\/span><\/div>\n
\u00a0<\/span><\/div>\n
Syntax<\/span><\/span><\/div>\n
Object DataTable.Compute(<\/strong>string expression , string filter)<\/strong><\/span><\/div>\n
\u00a0<\/span><\/div>\n
Expression<\/strong>\u00a0– The expression to compute.<\/span><\/div>\n
Filter<\/strong>\u00a0– The filter to limit the rows that evaluate in the expression.<\/span><\/div>\n
\u00a0<\/span><\/div>\n
This method’s return type is\u00a0System.Object<\/strong>. So, you have to cast it with appropriate data type.<\/span><\/div>\n
\u00a0<\/span><\/div>\n
The following operations can be passed through as expression parameter.<\/span><\/div>\n
<\/div>\n
Sum -> Sum<\/strong><\/span><\/div>\n
Average -> Avg<\/strong><\/span><\/div>\n
Minimum -> Min<\/strong><\/span><\/div>\n
Maximum -> Max<\/strong><\/span><\/div>\n
Count -> Count<\/strong><\/span><\/div>\n
Statistical standard deviation ->StDev<\/strong><\/span><\/div>\n
Statistical variance -> Var<\/strong><\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n
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Example:<\/span><\/span><\/div>\n
\u00a0<\/span><\/div>\n
DataTable dtTotal = new DataTable();<\/strong><\/span><\/div>\n
\u00a0<\/span><\/div>\n
Suppose your DataTable dtTotal contain two columns as<\/span><\/div>\n
\u00a0<\/span><\/div>\n
Name\u00a0\u00a0\u00a0\u00a0\u00a0 Price<\/strong><\/span><\/div>\n
\u00a0x\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 20<\/strong><\/span><\/div>\n
\u00a0y\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 50<\/strong><\/span><\/div>\n
\u00a0z\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30<\/strong><\/span><\/div>\n
\u00a0u\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 10<\/strong><\/span><\/div>\n
\u00a0x\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 25<\/strong><\/span><\/div>\n
\u00a0y\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 15<\/strong><\/span><\/div>\n
\u00a0x\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 35<\/strong><\/span><\/div>\n
\u00a0u\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 20<\/strong><\/span><\/div>\n
\u00a0<\/span><\/div>\n
If you want to count the total price of distinct names, then you can use compute method like below statement.<\/span><\/div>\n
\u00a0<\/span><\/div>\n
int total = dtTotal.Compute(“Sum ( Price ) “, “Name = ‘x'”);<\/strong><\/span><\/div>\n
\u00a0<\/span><\/div>\n
Output – 80<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/div>\n
This method looks pretty simple, but sometimes its SQL like Aggregate Function functionality solves complex calculations.<\/span><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

http:\/\/www.mindfiresolutions.com\/DataTable-Compute-Method-628.php<\/p>\n","protected":false},"excerpt":{"rendered":"

Compute is one of the methods of DataTable class. This method computes an expression on the current rows that pass the filter criteria. \u00a0 Syntax… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-121","post","type-post","status-publish","format-standard","hentry","category-vb-net"],"_links":{"self":[{"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/posts\/121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/comments?post=121"}],"version-history":[{"count":0,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/posts\/121\/revisions"}],"wp:attachment":[{"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/media?parent=121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/categories?post=121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/tags?post=121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}