Question

好吧，我有以下命令：IOrganizationService.Retrieve(String entityName, Guid ID, ColumnSet columnSet)参考：IOrganizationService

我尝试了SDK代码示例，但是在创建记录时使用Guid来获取检索信息，例如：Guid _accountId = orgService.Create(account);

我想使用Account（Entity）的名称获取此Guid，怎么办？

Answer 1

您必须使用RetrieveMultiple方法和QueryExpression来实现。例如，下面的MSDN code example是自我解释的，用于获取与lastname = “Brown”的联系人

//  Query using ConditionExpression and FilterExpression
ConditionExpression condition1 = new ConditionExpression();
condition1.AttributeName = "lastname";
condition1.Operator = ConditionOperator.Equal;
condition1.Values.Add("Brown");            

FilterExpression filter1 = new FilterExpression();
filter1.Conditions.Add(condition1);

QueryExpression query = new QueryExpression("contact");
query.ColumnSet.AddColumns("firstname", "lastname");
query.Criteria.AddFilter(filter1);

EntityCollection result1 = _serviceProxy.RetrieveMultiple(query);
Console.WriteLine();Console.WriteLine("Query using Query Expression with ConditionExpression and FilterExpression");
Console.WriteLine("---------------------------------------");
foreach (var a in result1.Entities)
{
    Console.WriteLine("Name: " + a.Attributes["firstname"] + " " + a.Attributes["lastname"]);
}

查询表达式用于检索多个记录的方法中，例如 IOrganizationService.RetrieveMultiple 方法，该方法在对由指定的结果集执行操作的消息中查询表达式，例如BulkDeleteRequest和当未知特定记录的ID时。

Reference

Answer 2

我使用查询获得了解决方案：

import os

output_2d_list = []
current_working_directory = os.path.abspath('.')

# Iterates over all files contained within the same folder as the python script.
for filename in os.listdir(current_working_directory):
    if filename.endswith('.pts'):

        # Ensuring that if something goes wrong during read, that the program exits gracefully.
        try:
            with open(filename, 'r') as current_file:

                # Reads each line of the file, and creates a 1d list of each point: e.g. [1,2].
                for line in current_file.readlines():
                    point = line.split(' ')
                    x = int(point[0])
                    y = int(point[1])
                    point_as_array = [x, y]
                    output_2d_list.append(point_as_array)
        except IOError:
            print "Something went wrong when attempting to read file."

# For testing purposes to see the output of the script.
# In production, you would be working with output_2d_list as a variable instead.
print output_2d_list

这将使用帐户名返回Guid信息。

Answer 3

查询表达式是一种选择。我发现效率最低。寻找更常用的方法：

获取Xml，查询效率更高，但开发时间更长。这是获取计数，总和或复杂标准的首选方法： https://msdn.microsoft.com/en-us/library/gg328332.aspx
早期，查询是开发最快的，更用户友好但效率较低的查询。这是通过id或name之类的简单标准获取数据的首选方法： https://msdn.microsoft.com/en-us/library/gg328499.aspx

如何在Dynamics 365 SDK中检索没有向导的实体？

3 个答案: