从PowerShell中的Sharepoint文档库中打开xml

Question

我正在尝试使用powershell从sharepoint文档库中操作xml文件。 不幸的是我无法打开它并将其转换为xml。 :(我在文档库中有相同的文件，本地硬盘驱动器。当我从硬盘驱动器打开它时一切都很好。当我从Sharepoint文档库打开它时，转换为xml失败，因为在开头的一个额外的字符我用二进制文件比较了$ splistitem.File.OpenBinary（）和get-content C：.... \\ file.xml的结果和它的相同。问题是从字节中获取字符串。我尝试了所有可用的编码，但没有任何效果。这是我的代码：

   # Add SharePoint snapin if needed
    if ((Get-PSSnapin -Name Microsoft.SharePoint.Powershell -ErrorAction SilentlyContinue)     -eq $null)
    {
        Add-PSSnapin Microsoft.SharePoint.Powershell
    }

...
    $splistitem = ...
...

    $encode = New-Object System.Text.UTF8Encoding

    [xml]$xmlFromSharepoint = $encode.GetString($splistitem.File.OpenBinary()) #throws exception
    [xml]$xmlFromFile = get-content C:\....\file.xml #works fine

    $web.Dispose()

    Write-Host "Press any key to close ..."
    $x = $host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")

抛出的异常是消息：

        Cannot convert value "?<?xml version="1.0" encoding="utf-8"?> 
..." to type "System.Xml.XmlDocument". Error: "Data at the
    root level is invalid. Line 1, position 1."
    At C:\aaa.ps1:14 char:24
    + [xml]$xmlFromSharepoint <<<<  = $encode.GetString($splistitem.File.OpenBinary
    ())
        + CategoryInfo          : MetadataError: (:) [], ArgumentTransformationMet
       adataException
        + FullyQualifiedErrorId : RuntimeException

Answer 1

我在回答自己。 :)

文件前面的字符是UTF8编码的字节顺序标记。 我发现我可以直接从sharepoint流加载xml文件。 这解决了这个问题。 我的目标是在sharepoint库中为Reporting Services数据源添加连接字符串。 .rsds文件是一个普通的xml文件，用于保存连接字符串。 这是修改它的代码：

# Add SharePoint snapin if needed
if ((Get-PSSnapin -Name Microsoft.SharePoint.Powershell -ErrorAction SilentlyContinue)     -eq $null)
{
    Add-PSSnapin Microsoft.SharePoint.Powershell
}

#Configure Connection strings
$web = Get-SPWeb "http://localhost/c1"
$reportsList = $web.Lists | Where-Object { $_.Title -eq "Reports" }
$dataSource = $reportsList.Items | Where-Object { $_.Name -eq "Datasource.rsds" }
$dataSource.File.CheckOut();
$xml = New-Object System.Xml.XmlDocument
$stream = $dataSource.File.OpenBinaryStream();
$xml.Load($stream)
$xml.DataSourceDefinition.ConnectString = "test"
$stream.Position = 0;
$stream.SetLength(0);
$xml.Save($stream);
$dataSource.File.SaveBinary($stream)
$dataSource.File.CheckIn("");
$web.Dispose()

Write-Host "Press any key to continue ..."
$x = $host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")

实际上我意识到上面的代码不起作用。 要修改报告，我必须使用ReportServer Web服务。 这是现在的工作代码：

function ConfigureConnectionString
{
param($webUrl, $connectionString)
    $reportServerURI = "http://$serverUrl/ReportServer"
    $ReportPathWildCard = "/";
    $NameSharedSchedule="NeverExpireCache";

    $reportServerURI2010 = "$reportServerURI/ReportService2010.asmx?WSDL"
    $RS = New-WebServiceProxy -Class 'RS' -NameSpace 'RS' -Uri $reportServerURI2010 -UseDefaultCredential
    $dataSources = $RS.ListChildren($ReportPathWildCard,$true) | Where-Object {$_.TypeName -eq "DataSource" -and $_.Path -like "*$webUrl*"}
    foreach($ds in $dataSources) {
        $dsDefinition = $RS.GetDataSourceContents($ds.Path)

        $dsDefinition.CredentialRetrieval = "Store"
        $dsDefinition.Enabled = "TRUE";
        $dsDefinition.UserName = "domain\user";
        $dsDefinition.Password = "Password";
        $dsDefinition.ConnectString = $connectionString;

        #Update the DataSource with this new content
        $RS.SetDataSourceContents($ds.Path, $dsDefinition);
    }
}