Hi, I am adding an attachment to a feature on the feature service. My issue is I am able to add the attachment to the feature, but I am not sure how to push the attachment to the feature service. Here is what I did: private async void save ( ) { await feature . LoadAsync ( ) ; // bytes is the byte array containing data of the file var result = await feature . AddAttachmentAsync ( App . _file . Name , @"image/" , bytes ) ; ServiceFeatureTable sft = feature . FeatureTable as ServiceFeatureTable ; await sft . UpdateFeatureAsync ( feature ) ; await sft . ApplyEditsAsync ( ) ; } Debugging shows that feature.AddAttachmentAsync() works as expected. After that line, I tried feature.GetAttachmentAsync() and it returns the just added attachment. However, I was not able to sync the attachment to the feature service. That feature service has attachment enabled. Am I missing any steps here? Appreciate any help. Best Yifan

You can check for `CanEditAttachments` to know if you're able to add/update/delete attachments for the specified feature. You can also check the result of `ApplyEditsAsync` to know whether any of the edit operation failed. if ( feature . CanEditAttachments ) await feature . AddAttachmentAsync ( "test.png" , "image/png" , bytes ) ; var table = layer . FeatureTable as ServiceFeatureTable ; var edits = await table . ApplyEditsAsync ( ) ; var editResult = edits . FirstOrDefault ( r = > r is FeatureEditResult && ( ( FeatureEditResult ) r ) . AttachmentResults . FirstOrDefault ( ar = > ar . CompletedWithErrors || ar . Error != null ) != null ) as FeatureEditResult ; In your code, is `App . _file . Name` full file name including path? This should be file name with extension. And the `contentType` parameter should be one of the MIME types that your server support. (i.e. image/png, text/plain, etc.)

nav[aria-label="Primary Navigation"] { padding: 0; & ul { list-style: none; width: 100%; display: flex; flex-direction: row; justify-content: start; align-items: start; gap: 30px; padding: 0; & li { margin: 0; } & ul li { list-style: none; } } }

Add attachment to a feature using Xamarin Android

YifanLiu

Hi,

I am adding an attachment to a feature on the feature service. My issue is I am able to add the attachment to the feature, but I am not sure how to push the attachment to the feature service. Here is what I did:

<SPAN class="keyword token">private</SPAN> <SPAN class="keyword token">async</SPAN> <SPAN class="keyword token">void</SPAN> <SPAN class="token function">save</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">await</SPAN> feature<SPAN class="punctuation token">.</SPAN><SPAN class="token function">LoadAsync</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// bytes is the byte array containing data of the file</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> result <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">await</SPAN> feature<SPAN class="punctuation token">.</SPAN><SPAN class="token function">AddAttachmentAsync</SPAN><SPAN class="punctuation token">(</SPAN>App<SPAN class="punctuation token">.</SPAN>_file<SPAN class="punctuation token">.</SPAN>Name<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">@"image/"</SPAN><SPAN class="punctuation token">,</SPAN> bytes<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp; ServiceFeatureTable sft <SPAN class="operator token">=</SPAN> feature<SPAN class="punctuation token">.</SPAN>FeatureTable <SPAN class="keyword token">as</SPAN> ServiceFeatureTable<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">await</SPAN> sft<SPAN class="punctuation token">.</SPAN><SPAN class="token function">UpdateFeatureAsync</SPAN><SPAN class="punctuation token">(</SPAN>feature<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">await</SPAN> sft<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ApplyEditsAsync</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Debugging shows that feature.AddAttachmentAsync() works as expected. After that line, I tried feature.GetAttachmentAsync() and it returns the just added attachment. However, I was not able to sync the attachment to the feature service. That feature service has attachment enabled.

Am I missing any steps here? Appreciate any help.

Best

Yifan

Find more posts tagged with

Accepted answers

JenniferNery

You can check for `CanEditAttachments` to know if you're able to add/update/delete attachments for the specified feature. You can also check the result of `ApplyEditsAsync` to know whether any of the edit operation failed.

<SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>feature<SPAN class="punctuation token">.</SPAN>CanEditAttachments<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">await</SPAN> feature<SPAN class="punctuation token">.</SPAN><SPAN class="token function">AddAttachmentAsync</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"test.png"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"image/png"</SPAN><SPAN class="punctuation token">,</SPAN> bytes<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> table <SPAN class="operator token">=</SPAN> layer<SPAN class="punctuation token">.</SPAN>FeatureTable <SPAN class="keyword token">as</SPAN> ServiceFeatureTable<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> edits <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">await</SPAN> table<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ApplyEditsAsync</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> editResult <SPAN class="operator token">=</SPAN> edits<SPAN class="punctuation token">.</SPAN><SPAN class="token function">FirstOrDefault</SPAN><SPAN class="punctuation token">(</SPAN>r <SPAN class="operator token">=</SPAN><SPAN class="operator token">></SPAN> r <SPAN class="keyword token">is</SPAN> FeatureEditResult <SPAN class="operator token">&&</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN>FeatureEditResult<SPAN class="punctuation token">)</SPAN>r<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>AttachmentResults<SPAN class="punctuation token">.</SPAN><SPAN class="token function">FirstOrDefault</SPAN><SPAN class="punctuation token">(</SPAN>ar <SPAN class="operator token">=</SPAN><SPAN class="operator token">></SPAN> ar<SPAN class="punctuation token">.</SPAN>CompletedWithErrors <SPAN class="operator token">||</SPAN> ar<SPAN class="punctuation token">.</SPAN>Error <SPAN class="operator token">!=</SPAN> <SPAN class="keyword token">null</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">!=</SPAN> <SPAN class="keyword token">null</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> FeatureEditResult<SPAN class="punctuation token">;</SPAN>

‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

In your code, is `App<SPAN>.</SPAN>_file<SPAN>.</SPAN>Name` full file name including path? This should be file name with extension. And the `contentType` parameter should be one of the MIME types that your server support. (i.e. image/png, text/plain, etc.)

All comments

YifanLiu

Hi Jennifer,

What I was missing is in this line:

 <SPAN class="" style="color: #0077aa; border: 0px; font-weight: inherit;">await</SPAN> feature<SPAN class="" style="color: #999999; border: 0px; font-weight: inherit;">.</SPAN><SPAN class="" style="color: #d74444; border: 0px; font-weight: inherit;">AddAttachmentAsync</SPAN><SPAN class="" style="color: #999999; border: 0px; font-weight: inherit;">(</SPAN><SPAN class="" style="color: #669900; border: 0px; font-weight: inherit;">"test.png"</SPAN><SPAN class="" style="color: #999999; border: 0px; font-weight: inherit;">,</SPAN> <SPAN class="" style="color: #669900; border: 0px; font-weight: inherit;">"image/png"</SPAN><SPAN class="" style="color: #999999; border: 0px; font-weight: inherit;">,</SPAN> bytes<SPAN class="" style="color: #999999; border: 0px; font-weight: inherit;">)</SPAN><SPAN class="" style="color: #999999; border: 0px; font-weight: inherit;">;</SPAN>

I put "image/" instead of "image/png", which is what breaks things.

Thank you!

Best,

Yifan

JenniferNery

<SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>feature<SPAN class="punctuation token">.</SPAN>CanEditAttachments<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">await</SPAN> feature<SPAN class="punctuation token">.</SPAN><SPAN class="token function">AddAttachmentAsync</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"test.png"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"image/png"</SPAN><SPAN class="punctuation token">,</SPAN> bytes<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> table <SPAN class="operator token">=</SPAN> layer<SPAN class="punctuation token">.</SPAN>FeatureTable <SPAN class="keyword token">as</SPAN> ServiceFeatureTable<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> edits <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">await</SPAN> table<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ApplyEditsAsync</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> editResult <SPAN class="operator token">=</SPAN> edits<SPAN class="punctuation token">.</SPAN><SPAN class="token function">FirstOrDefault</SPAN><SPAN class="punctuation token">(</SPAN>r <SPAN class="operator token">=</SPAN><SPAN class="operator token">></SPAN> r <SPAN class="keyword token">is</SPAN> FeatureEditResult <SPAN class="operator token">&&</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN>FeatureEditResult<SPAN class="punctuation token">)</SPAN>r<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>AttachmentResults<SPAN class="punctuation token">.</SPAN><SPAN class="token function">FirstOrDefault</SPAN><SPAN class="punctuation token">(</SPAN>ar <SPAN class="operator token">=</SPAN><SPAN class="operator token">></SPAN> ar<SPAN class="punctuation token">.</SPAN>CompletedWithErrors <SPAN class="operator token">||</SPAN> ar<SPAN class="punctuation token">.</SPAN>Error <SPAN class="operator token">!=</SPAN> <SPAN class="keyword token">null</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">!=</SPAN> <SPAN class="keyword token">null</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> FeatureEditResult<SPAN class="punctuation token">;</SPAN>

‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

YifanLiu

Thanks for the reply Nagma. I am developing for Android and the API is different from WPF. So, unfortunately, your suggestion would not work. Still appreciate it!

NagmaYasmin

Hi Yifan,

Have you tried to set up GenerateGeodatabaseParameters.AttachmentSyncDirection to sets the direction for the attachments to be synchronized.

GenerateGeodatabaseParameters.AttachmentSyncDirection Property

Hope that helps.

Nagma

Join the Conversation

Signed in members can post, follow updates, and more. New here? Register a free account.

Quick Links

Community Help
Find useful guides, FAQs, and documents to help you navigate and make the most of Esri Community.