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Update WebPreferences's ContextIsolation default value to true#785

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Yuvix25
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I've encountered the following error: "Error: contextBridge API can only be used when contextIsolation is enabled", even though I did enableContextIsolation.

In#411, the same issue was reported, and the problem was traced down to the fact that the default value ofContextIsolation was set to the wrong value, which made that attribute un-editable.

I then found out that the default value ofContextIsolation was changed from false to true since Electron 12, as notedhere, so I fixed it.

@GregorBiswanger
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Thanks for your PR! Have you checked whether the IPC communication is still working afterwards?

@Yuvix25
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Not yet. Watching the "Contributing Getting Started" video as we speak.
Will update once I do 👍🏻

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@Yuvix25
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@GregorBiswanger I compiled it on my side, with the default value now being set to true, but I still get that error for some reason. Any idea what could be the cause?

@GregorBiswanger
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We changed the default value totrue in the past. Electron already has it set tofalse for security reasons. However, we need it for the internal communication of our .NET API to the native Electron API. So I thought you found a solution with your PR.

Without an error message, I can't help you as to what your problem might be.

@Yuvix25
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Yuvix25 commentedJun 20, 2023•
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These are theWebPrefrences I'm using:

WebPreferences=newWebPreferences(){ContextIsolation=true,EnableRemoteModule=true,NodeIntegration=true,Preload=Path.Combine(Directory.GetCurrentDirectory(),"wwwroot","js","utils.js"),}

And this is the error I'm receiving:

node:electron/js2c/renderer_init:2 Unable to load preload script: C:\Users\[username]\[path-to-project]\obj\Host\bin\wwwroot\js\utils.js(anonymous) @ node:electron/js2c/renderer_init:2node:electron/js2c/renderer_init:2 Error: contextBridge API can only be used when contextIsolation is enabled    at checkContextIsolationEnabled (node:electron/js2c/renderer_init:2:5653)    at Object.exposeInMainWorld (node:electron/js2c/renderer_init:2:5764)    at Object.<anonymous> (C:\Users\[username]\[path-to-project]\obj\Host\bin\wwwroot\js\utils.js:441:15)    at Object.<anonymous> (C:\Users\[username]\[path-to-project]\obj\Host\bin\wwwroot\js\utils.js:457:3)    at Module._compile (node:internal/modules/cjs/loader:1174:14)    at Module._extensions..js (node:internal/modules/cjs/loader:1229:10)    at Module.load (node:internal/modules/cjs/loader:1044:32)    at Module._load (node:internal/modules/cjs/loader:885:12)    at f._load (node:electron/js2c/asar_bundle:2:13330)    at o._load (node:electron/js2c/renderer_init:2:3109)

Also, they did change the default value totrue now. See the link I posted in the original comment.

@Yuvix25
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Maybe I need to remove<PackageReference Include="ElectronNET.API" Version="23.6.1" /> from the[project-name].csproj file? Or perhaps replace it with something local?

@Yuvix25
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@GregorBiswanger any idea?

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