How use the filter using query string in microsoft graph api using xamarin c#?

Yosuf Kani S 0

I try to filter the files based on their file extensions, when i try to use not or ne in my query i get exception as OData error.

B santhiswaroop naik 395 Reputation points

2023-07-04T18:31:36.2533333+00:00
To use filters in Microsoft Graph API using Xamarin C# and query string, you can construct the URL with the appropriate filter expression. Here's an example of how to use filters in Microsoft Graph API using query string in Xamarin C#:

Construct the URL: Build the URL for the Microsoft Graph API endpoint, specifying the resource and any required query parameters.

string graphUrl = "https://graph.microsoft.com/v1.0/";

string apiEndpoint = "users";

string filterExpression = "$filter=displayName eq 'John Smith'";

string requestUrl = $"{graphUrl}{apiEndpoint}?{filterExpression}";

In this example, we are querying the "users" resource and applying a filter expression to retrieve users with the display name "John Smith".

Make the HTTP request: Use HttpClient or a similar library to make the HTTP request to the constructed URL.

HttpClient httpClient = new HttpClient();

httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);

HttpResponseMessage response = await httpClient.GetAsync(requestUrl);

Ensure that you have obtained an access token to authenticate the request and set it in the Authorization header.

Process the response: Process the response from the API call to retrieve the filtered data.

if (response.IsSuccessStatusCode) { string responseContent = await response.Content.ReadAsStringAsync(); // Process the response data } else { // Handle the error response }

Parse the response content according to the data structure you expect and handle any errors that may occur.

Remember to handle authentication and obtain the necessary access token before making the request to the Microsoft Graph API. The specific implementation details may vary depending on your authentication approach (e.g., OAuth, Azure AD, etc.) and the libraries you are using in your Xamarin C# project.

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