C# CSOM - Check if File Exists in Document Library

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C# CSOM - Check if File Exists in Document Library

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You could consider the following approaches to determine whether file exists or not.

Query based

You could construct CAML query to find list item by its Url as demonstrated below:

```
public static bool FileExists(List list, string fileUrl)
{
var ctx = list.Context;
var qry = new CamlQuery();
qry.ViewXml = string.Format("{0}",fileUrl);
var items = list.GetItems(qry);
ctx.Load(items);
ctx.ExecuteQuery();
return items.Count > 0;
}

```

Usage

```
using (var ctx = GetSPOContext(webUri,userName,password))
{
var list = ctx.Web.Lists.GetByTitle(listTitle);
if(FileExists(list,"/documents/SharePoint User Guide.docx"))
{
//...
}
}

```

`Web.GetFileByServerRelativeUrl` Method

Use [Web.GetFileByServerRelativeUrl Method](https://msdn.microsoft.com/en-us/library/microsoft.sharepoint.client.web.getfilebyserverrelativeurl%28v=office.15%29.aspx) to return the file object located at the specified server-relative URL.

If file does not exists the exception [Microsoft.SharePoint.Client.ServerException](https://msdn.microsoft.com/en-us/library/microsoft.sharepoint.client.serverexception.aspx) will be encountered:

```
public static bool TryGetFileByServerRelativeUrl(Web web, string serverRelativeUrl,out Microsoft.SharePoint.Client.File file)
{
var ctx = web.Context;
try{
file = web.GetFileByServerRelativeUrl(serverRelativeUrl);
ctx.Load(file);
ctx.ExecuteQuery();
return true;
}
catch(Microsoft.SharePoint.Client.ServerException ex){
if (ex.ServerErrorTypeName == "System.IO.FileNotFoundException")
{
file = null;
return false;
}
else
throw;
}
}

```

Usage:

```
using (var ctx = GetSPOContext(webUri,userN

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