C# 将子查询值映射到属性

我用它来获取和映射数据。我有以下查询和相关类

SELECT pinv.* , sp.SupplierId,sp.SupplierName,sp.Contact1,sp.SupplierAddress,ac.AccountId,ac.AccountName, 
(Select Count(*) from ReturnInvoices rinv Where rinv.InvoiceId = pinv.PurchaseInvoiceId) as ReturnInvoicesCount  
FROM PurchaseInvoices pinv  
LEFT JOIN Suppliers sp ON sp.SupplierId = pinv.SupplierId  
LEFT JOIN Accounts ac on ac.AccountId = pinv.AccountId  

还有这个班

public class PurchaseInvoice
{
    public int PurchaseInvoiceId { get; set; }
    public int PurchaseOrderId { get; set; }
    public string PurchaseInvoiceType { get; set; }
    public int SupplierId { get; set; }
    public int AccountId { get; set; }
    public int ReceiptNumber { get; set; }
    public int ReturnInvoicesCount { get; set; }  // to map ReturnInvoiceCount by SubQuery
    public DateTime PromisedDate { get; set; }
    public DateTime InvoiceDate { get; set; }
    public decimal InvoiceQuantity { get; set; }
    public decimal Discount { get; set; }
    public decimal Tax { get; set; }
    public decimal ShippingCharges { get; set; }
    public decimal Surcharge { get; set; }
    public string PaymentMode { get; set; }
    public decimal SubTotal { get; set; }
    public decimal TotalPayment { get; set; }
    public decimal AmountPaid { get; set; }
    public decimal AmountRemaining { get; set; }
    public string Comments { get; set; }
    public string Status { get; set; }
    public DateTime UpdatedDate { get; set; }

    public Supplier Supplier { get; set; }
    public ProductReceived ProductReceived { get; set; }
    public Account Account { get; set; }
}  

我不分享其他课程，因为它们不相关。现在，若我运行上面的查询，我会得到完美的结果。获取结果后，dapper返回的所有数据都很好，但是没有映射到ReturnInvoicesCount（或者idk其他问题）。这就是我使用整洁的方式

using (SqlConnection connection = new SqlConnection(_conString))
{
    var query = QueryHelper.GetPurchaseInvoicesQuery(start, end, simpleSearchText, searchTokensList);
    // ignore above line, just getting query with parameters etc

    var data = await connection.QueryAsync<PurchaseInvoice, Supplier, Account>(query.Query,
        query.queryParams, splitOn: "SupplierId,AccountId");

    return data;
}  

使用（SqlConnection=newsqlconnection（\u conString））
{
var query=QueryHelper.GetPurchaseInvoicesQuery（开始、结束、simpleSearchText、searchTokensList）；
//忽略上面的行，只获取带有参数的查询等
var data=await connection.QueryAsync（query.query，
query.queryParams，splitOn：“供应商ID，账户ID”）；
返回数据；
}  

正如我所说，我得到了正确的结果映射，除了字段

returninvoicesont

为0。在服务器上时，可以看到

ReturnInvoiceCount

有一个值

---

您在

供应商ID

（映射到

供应商

）和

账户ID

（映射到

账户

）上有拆分。问题在于

returninvoicesont

位于要正确映射的错误列位置。目前，您告诉dapper，ReturnInvoiceScont属于帐户

由于

returninvoicescont

属于

PurchaseInvoice

您必须将其移动到

SupplierId

之前。非常感谢你亚历克斯：）这正是我错过的。现在已经解决了。守福