Question

我正在创建一个控制台应用程序，为每个实体下载附件（注释）。想法是创建一个主文件夹，其中包含实体名称，实体文件夹的子文件夹，以注释的对象ID命名，每个子文件夹将是与文件夹的id对应的文件。到目前为止，这是我的代码：

string filepath = "C:\\";
String fetchXmlNote = "<fetch mapping='logical' count='20'>";
fetchXmlNote += "<entity name='annotation'>";
fetchXmlNote += "<attribute name='filename'/>";
fetchXmlNote += "<attribute name='documentbody'/>";
fetchXmlNote += "<attribute name='mimetype'/>";
fetchXmlNote += "<attribute name='objectid'/>";
fetchXmlNote += "<link-entity name='" +EntityName+ "' from='" + EntityName + "id' to='objectid'>";
fetchXmlNote += "</link-entity>";
fetchXmlNote += "</entity>";
fetchXmlNote += "</fetch>";

Microsoft.Xrm.Sdk.EntityCollection result = service.RetrieveMultiple(new FetchExpression(fetchXmlNote));
if (result != null)
{
    FilePath = FilePath + EntityName + "\\";

    foreach (Entity e in result.Entities)
    {
        Directory.CreateDirectory(FilePath + e.GetAttributeValue<EntityReference>("objectid").Id.ToString());
        if (!String.IsNullOrWhiteSpace(e.Attributes["documentbody"].ToString()))
        {
            byte[] data = Convert.FromBase64String(e.Attributes["documentbody"].ToString());

            File.WriteAllBytes(FilePath + e.Attributes["filename"].ToString(), data);
        }

直到现在我已经制作了用于下载文件的fetch xml，并且我已经为每个objectid创建了文件夹，但我需要将每个文件放在相应的文件夹中。请注意，需要检查重复。任何帮助表示赞赏。

Answer 1

尝试检查每个file/folder是否已存在

using System.IO;


if (result != null)
{
FilePath = FilePath + EntityName;
if(CheckIfFolderExists(FilePath + EntityName)==false) //Check primary folder, if do not exists create one
{
    Directory.CreateDirectory(FilePath + EntityName); //Create primary folder
}
FilePath+= "\\"; 
foreach (Entity e in result.Entities)
{  
    if(CheckIfFolderExists(FilePath + e.GetAttributeValue<EntityReference>("objectid").Id.ToString()))==false) //Check subfolder, if do not exists create one
    {
     Directory.CreateDirectory(FilePath + e.GetAttributeValue<EntityReference>("objectid").Id.ToString()); //Create subfolder inside primary folder
    }
//Also check here, if file with the same name already exists, if not create one
    if (!String.IsNullOrWhiteSpace(e.Attributes["documentbody"].ToString()) && !File.Exists(FilePath + e.Attributes["filename"].ToString()))
    {
        byte[] data = Convert.FromBase64String(e.Attributes["documentbody"].ToString());
        File.WriteAllBytes(FilePath + e.Attributes["filename"].ToString(), data);
    }
}
}
public static bool CheckIfFolderExists(string path)
{
 return Directory.Exists(path);
}

将附件下载到每个文件夹，其名称是附件crm2011的ID

1 个答案: