How to check for the sub folder in the document library Is already Exist using CSOM?

Question

Hi,
My requirement is to create the  folder and sub folder in SharePoint document library. If already exist leave it or create the new folder and the subfolder in the Document library using client side object model
I able to check for the parent folder.
But cant able to check the subfolder in the document library.
How to check for  the sub folder in the document library?
Here is the code for the folder
IsFolder alredy Exist.
private
string IsFolderExist(string InputFolderName)
string retStatus = false.ToString();
try
ClientContext context =
new ClientContext(Convert.ToString(ConfigurationManager.AppSettings["DocumentLibraryLink"]));
            context.Credentials =
CredentialCache.DefaultCredentials;
List list = context.Web.Lists.GetByTitle(Convert.ToString(ConfigurationManager.AppSettings["DocumentLibraryName"]));
FieldCollection fields = list.Fields;
CamlQuery camlQueryForItem =
new CamlQuery();
            camlQueryForItem.ViewXml =
string.Format(@"<View  Scope='RecursiveAll'>
<Query>
                                        <Where>
<Eq>
<FieldRef Name='FileDirRef'/>
<Value Type='Text'>{0}</Value>
                                            </Eq>
</Where>
</Query>
                            </View>",
@"/sites/test/hcl/"
+ InputFolderName);
            Microsoft.SharePoint.Client.ListItemCollection listItems = list.GetItems(camlQueryForItem);
            context.Load(listItems);
            context.ExecuteQuery();
if (listItems.Count > 0)
                retStatus =
true.ToString();
else
                retStatus =
false.ToString();
catch (Exception ex)
            retStatus =
"X02";
return retStatus;
thanks
Sundhar 

Answer 1

Hi Sundhar,
According to your description, you might want to check the existence of sub folder in a folder of a library using Client Object Model.
Please take the code demo below for a try, it will check whether there is sub folder in a given folder:
public static void createSubFolder(string siteUrl, string libName, string folderServerRelativeUrl)
ClientContext clientContext = new ClientContext(siteUrl);
List list = clientContext.Web.Lists.GetByTitle(libName);
CamlQuery camlQuery = new CamlQuery();
camlQuery.ViewXml =
@"<View Scope='RecursiveAll'>
<Query>
<Where>
<Eq>
<FieldRef Name='FSObjType' />
<Value Type='Integer'>1</Value>
</Eq>
</Where>
</Query>
</View>";
//camlQuery.FolderServerRelativeUrl = "/Lib1/folder1";
camlQuery.FolderServerRelativeUrl = folderServerRelativeUrl;
ListItemCollection items = list.GetItems(camlQuery);
clientContext.Load(items);
clientContext.ExecuteQuery();
Console.WriteLine(items.Count);
if (0 == items.Count)
//create sub folder here
Best regards
Patrick Liang
TechNet Community Support