改变查询表达式 post 创建

Question

我正在尝试创建一个新查询，然后根据特定条件对其进行编辑和添加。括号[]

中写的函数我不知道怎么做

/* Create the query */
var query = from quote in Query() 
where quote.documentNum = document_Input
select quote;

// Now change the sort field
query = filter.sort == SortFied.quote ? [alter the query function to sort by documentNum<string>] : [alter the query function to sort by enteredData<DateTime?>]

// Now change the sort direction
query = filter.sortDir == SortDirection.Ascending ? [alter the query to sort in an Ascending order] : [alter the query to sort in an Descending order]

这只是两个必须添加的条件afterwards.The之后添加它的目的是避免每个可能的条件重复代码。

Answer 1

我假设是这样的。

var query = Query().Where(x => x.documentNum == document_Input);
query = filter.sortDir == SortDirection.Ascending ? query.OrderBy(x => filter.sort == SortFied.quote ? x.documentNum : x.enteredData) : query.OrderByDescending(x => filter.sort == SortFied.quote ? x.documentNum : x.enteredData);

您可以通过使用委托进一步减少代码重复。

改变查询表达式 post 创建

Altering Query expression post creation

c#

query-expressions