CSOM：服务器不允许将邮件大于 2097152 字节

在sharepoint csom, js调用中，功能需求是将图片转换为字节，存在sharepoint list中。当提交的内容大于1M左右时，就会提示"Original error: Microsoft.SharePoint.Client.InvalidClientQueryException: 请求消息太大。服务器不允许大于 2097152 字节的消息"。

解决方案：在应用服务器上，powshell进行配置就行。

$ws = [Microsoft.SharePoint.Administration.SPWebService]::ContentService 
$ws.ClientRequestServiceSettings.MaxReceivedMessageSize = 209715200 
$ws.ClientRequestServiceSettings.MaxParseMessageSize = 209715200 
$ws.Update()  

 function updateListItem(title, logo, webID, summary, themeBackground) {
        var clientContext = new SP.ClientContext();
        var oList = clientContext.get_web().get_lists().getByTitle('SiteInfo');
        var ID= $("#siteInfoItemID").val();
        this.oListItem = oList.getItemById(ID);
        oListItem.set_item('Title', title);
        oListItem.set_item('ThemeLogo', logo);
        oListItem.set_item('Summary', summary);
        oListItem.set_item('ThemeBackground', themeBackground);
        
        oListItem.update();
        clientContext.executeQueryAsync(
            Function.createDelegate(this, this.onQuerySucceeded),
            Function.createDelegate(this, this.onQueryFailed)
        );
    }

 参考链接：http://www.guanggua.com/question/18861407-sharepoint-error-the-server-does-not-allow-messages-larger-than-2097152-bytes.html