无法从 'Microsoft.Xrm.Sdk.Query.QueryExpression' 转换为 'Microsoft.Crm.Sdk.Query.QueryBase

Question

我在使用以下代码时遇到上述错误。

我在某处读到说我应该删除所有对 Microsoft.Crm.Sdk.dll 的引用，但这没有用。如果可以请帮忙。

using System;

using System.Collections.Generic;

using Microsoft.Xrm.Sdk;

using InvoiceMVCApp.Models;

using Microsoft.Xrm.Sdk.Query;

using Microsoft.Xrm.Client.Services;

using Microsoft.Xrm.Client;

namespace InvoiceMVCApp.DAL
{

    public class DAL_InvoicesEntity
    {
        public List<InvoicesModel> RetriveRecords()
        {
            var connection = new CrmConnection("Server=CRM Online");
            using (OrganizationService service = new OrganizationService("ConnectionString", connection))
            {
                QueryExpression query = new QueryExpression
                {
                    EntityName = "invoice",
                    ColumnSet = new ColumnSet("invoiceid", "customer", "invoicename", "paymentreceived", "commission", "adminfee", "discountamount")
                };
                List<InvoicesModel> info = new List<InvoicesModel>();
                EntityCollection invoiceRecord = service.RetrieveMultiple(query);

                if (invoiceRecord != null && invoiceRecord.Entities.Count > 0)
                {
                    InvoicesModel invoiceModel;
                    for (int i = 0; i < invoiceRecord.Entities.Count; i++)
                    {
                        invoiceModel = new InvoicesModel();
                        if (invoiceRecord[i].Contains("invoiceid") && invoiceRecord[i]["invoiceid"] != null)
                            invoiceModel.InvoiceID = (Guid)invoiceRecord[i]["invoiceid"];
                        if (invoiceRecord[i].Contains("customer") && invoiceRecord[i]["customer"] != null)
                            invoiceModel.ClientName = ((EntityReference)invoiceRecord[i]["customer"]);
                        if (invoiceRecord[i].Contains("invoiceid") && invoiceRecord[i]["invoiceid"] != null)
                            invoiceModel.InvoiceNumber = invoiceRecord[i]["invoiceid"].ToString();
                        if (invoiceRecord[i].Contains("commission") && invoiceRecord[i]["commission"] != null)
                            invoiceModel.Commission = (decimal)(invoiceRecord[i]["commission"]);
                        if (invoiceRecord[i].Contains("adminfee") && invoiceRecord[i]["adminfee"] != null)
                            invoiceModel.AdminFee = (decimal)invoiceRecord[i]["adminfee"];
                        if (invoiceRecord[i].Contains("discountamount") && invoiceRecord[i]["discountamount"] != null)
                            invoiceModel.Discount = ((decimal)invoiceRecord[i]["discountamount"]);
                        info.Add(invoiceModel);
                    }
                }
                return info;
            }
        }
    }
}

Answer 1

尝试清理 -> 重建。没有必要删除引用，您可以使用全名代替 Microsoft.Xrm.Sdk.Query.QueryExpression query = new Microsoft.Xrm.Sdk.Query.QueryExpression(){};

Answer 2

您的列集中似乎有无效的列名。
"customer" 应该是 "customerid".
"invoicename" 应该是 "name".
"adminfee"、"commission" 和 "paymentreceived" 等自定义字段将始终具有基于创建它们的解决方案的前缀（默认为 new_）。

此外，当前通过 SDK 连接的首选方法是 Microsoft.Xrm.Tooling.Connector 命名空间中的 CrmServiceClient class。

要找到它，您可以在 NuGet 中搜索 "Xrm Tooling"。

此外，如果您要将结果转换为自定义 InvoicesModel class，您可能需要查看 Early Bound 编程风格，您可以在其中使用工具自动生成代理classes 包含您的 D365 实体的属性。这避免了为从系统检索的数据创建自己的 "model" classes 的需要。

这是一个工作示例，可以让您了解一些可能性：

using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Tooling.Connector;
using System;
using System.Collections.Generic;
using System.Linq;

public class InvoicesModel
{
    public Guid? InvoiceID { get; set; }
    public EntityReference ClientName { get; set; }
    public string InvoiceNumber { get; set; }
    public string Name { get; set; }
    public bool? PaymentReceived { get; set; }
    public decimal? Commission { get; set; }
    public decimal? AdminFee { get; set; }
    public decimal? DiscountAmount { get; set; }
}

public List<InvoicesModel> RetrieveInvoiceModels(string connectionString)
{
    var svc = new CrmServiceClient(connectionString);

    var query = new QueryExpression
    {
        EntityName = "invoice",                
        ColumnSet = new ColumnSet("invoiceid", "customerid", "invoicenumber", "name", "discountamount"),
        TopCount = 10
        ///Invalid column names: "paymentreceived", "commission", "adminfee",
    };

    var invoices = svc.RetrieveMultiple(query).Entities.ToList();

    var invoiceModels = invoices.Select(i =>
        new InvoicesModel
        {
            InvoiceID = i.GetAttributeValue<Guid>("invoiceid"),
            ClientName = i.GetAttributeValue<EntityReference>("customerid"),
            InvoiceNumber = i.GetAttributeValue<string>("invoicenumber"),
            Name = i.GetAttributeValue<string>("name"),
            DiscountAmount = i.GetAttributeValue<Money>("new_discountamount")?.Value

            ///for when columnn names are fixed:
            //PaymentReceived = i.GetAttributeValue<bool>("new_paymentreceived")
            //AdminFee = i.GetAttributeValue<Money>("new_adminfee")?.Value,
            //Commission = i.GetAttributeValue<Money>("new_commission")?.Value,
        })
        .ToList();
    return invoiceModels;
}

无法从 'Microsoft.Xrm.Sdk.Query.QueryExpression' 转换为 'Microsoft.Crm.Sdk.Query.QueryBase

cannot convert from 'Microsoft.Xrm.Sdk.Query.QueryExpression' to 'Microsoft.Crm.Sdk.Query.QueryBase

c#

asp.net-mvc

dynamics-crm