如何使我的dapper结果成为列表？

Question

为什么我不能添加

.ToList()

？ Intellisense唯一允许的是

.ToString()

。

//..
string sqlQuery = "SELECT sum(SellingPrice) as SellingPrice, sum(MarkupPercent) as MarkupPercent, sum(MarkupAmount) as MarkupAmount FROM ProfitMargins WHERE QuoteId in @QuoteId group by multiplier";
{
    List<ProfitMargin> profitMargin = (List<ProfitMargin>)await conn.QueryAsync<List<ProfitMargin>>(sqlQuery, new { QuoteId = QuoteIds.ToArray()})  //would like to add .ToList() here;

    return profitMargin;
}
//..

update

我认为问题与conn.queryAsync（conn是context.database.connection.connectionstring）而不是context.database.sqlquery

trory改变了这一点。

Answer 1

or

var results = await conn.QueryAsync<ProfitMargin>(sqlQuery, new { QuoteId = QuoteIds.ToArray()});
List<ProfitMargin> profitMargin = results.ToList();

我认为您正在尝试打电话

Task

try：

.ToList()

or

Answer 2

List<ProfitMargin> profitMargin = new List<ProfitMargin>(await conn.QueryAsync<ProfitMargin>(sqlQuery, new { QuoteId = QuoteIds.ToArray()}));

当@amy说，您需要使用List<ProfitMargin> profitMargin = (await conn.QueryAsync<ProfitMargin>(sqlQuery, new { QuoteId = QuoteIds.ToArray()})).ToList();

在等待评估时返回

conn.QueryAsync<ProfitMargin>(sqlQuery, new { QuoteId = QuoteIds.ToArray()}))

。

是以前答案的补充：

从C＃12中，也可以使用收集表达式。这简化了转换为：

Task<IEnumerable<ProfitMargin>>