How to get all Site Collections using C# CSOM

Question

My Code:

                SPOSitePropertiesEnumerable spp = null;
                Microsoft.Online.SharePoint.TenantAdministration.Tenant tenant = new Tenant(clientContext);
                int startIndex = 0;

                while (spp == null || spp.Count > 0)
                {
                    spp = tenant.GetSiteProperties(startIndex, true);
                    clientContext.Load(spp);
                    clientContext.ExecuteQuery();

                    foreach (SiteProperties sp in spp)
                    {
                        Response.Write("<br/> All Sites Collection: " + sp.Title + "<br/>");
                       // siteCols.Add(new SiteCol(sp.Title, sp.Url));

                      //  startIndex = siteCols.Count;
                    }
                    startIndex++;
                }

I am getting this Error : Method Microsoft.SharePoint.Client.ClientRuntimeContext.Load: type argument 'Microsoft.Online.SharePoint.TenantAdministration.SPOSitePropertiesEnumerable' violates the constraint of type parameter 'T

Is there any other way to retrieve all site collections?

Answer 1

The error:

Method Microsoft.SharePoint.Client.ClientRuntimeContext.Load: type argument 'Microsoft.Online.SharePoint.TenantAdministration.SPOSitePropertiesEnumerable' violates the constraint of type parameter 'T'.

occurs since there is mismatch between Microsoft.Online.SharePoint.Client.Tenant.dll assembly and the Microsoft.SharePoint.Client.dll assembly versions that are referenced in project.

Microsoft released the following SDKs:

• SharePoint Online Client Components SDK: Microsoft.Online.SharePoint.Client.Tenant.dll assembly version 16 (C:\Program Files\SharePoint Client Components\16.0\Assemblies) is shipped with this SDK
• SharePoint Server 2013 Client Components SDK: Microsoft.Online.SharePoint.Client.Tenant.dll assembly version 15 (C:\Program Files\SharePoint Client Components\Assemblies) is shipped with this SDK

Resolution

Ensure the proper version of Microsoft.Online.SharePoint.Client.Tenant.dll assembly is referenced.

For example, for SharePoint Online project the the following assembly should be referenced: Microsoft.Online.SharePoint.Client.Tenant, Version=16.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c

Answer 2

type(see):

Install-Package Microsoft.Sharepoint.2013.Client.16