每个 C# 脚本都会在控制台上抛出错误

Question

I've just created an Unity project with a clean installation, also created a C# script and attached to a 3D Game Object (Cube), but when I double-click to open the script it instantly says:

Exception thrown while invoking [OnOpenAssetAttribute] method 'Unity.CodeEditor.CodeEditor:OnOpenAsset (int,int,int)' : InvalidOperationException: Cannot start process because a file name has not been provided.
System.Diagnostics.Process.Start () (at <d465e2b2e5054d2787d6364114c43446>:0)
(wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
UnityEditor.DefaultExternalCodeEditor.OpenProject (System.String path, System.Int32 line, System.Int32 column) (at C:/buildslave/unity/build/Editor/Mono/CodeEditor/DefaultExternalCodeEditor.cs:96)
Unity.CodeEditor.CodeEditor.OnOpenAsset (System.Int32 instanceID, System.Int32 line, System.Int32 column) (at C:/buildslave/unity/build/Editor/Mono/CodeEditor/CodeEditor.cs:56)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

and

InvalidOperationException: Cannot start process because a file name has not been provided.
System.Diagnostics.Process.Start () (at <d465e2b2e5054d2787d6364114c43446>:0)
(wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
UnityEditor.DefaultExternalCodeEditor.OpenProject (System.String path, System.Int32 line, System.Int32 column) (at C:/buildslave/unity/build/Editor/Mono/CodeEditor/DefaultExternalCodeEditor.cs:96)
Unity.CodeEditor.CodeEditor.OpenFileAtLineColumn (System.String path, System.Int32 line, System.Int32 column) (at C:/buildslave/unity/build/Editor/Mono/CodeEditor/CodeEditor.cs:31)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

And if I, for example, try to use Debug.Log in the script, it says

'Debug' does not contain a definition for 'Log'

Nothing works.

I've already tried to reopen unity, create another project, install another version (I'm now using the latest 2019.2.0b1) and this always happens, I'm using Visual Studio and the errors are prompted in the Unity console.

Answer 1

解决方案是将 Visual Studio 设置为 Unity 的默认编辑器，正如评论部分中的某个人所说。

Answer 2

Do you have the correct .net frameworks installed? Try and install the latest ones. Its the only thing I can think of if you've already tried reinstall Unity.

Answer 3

Just a hunch. Try use Visual Studio 2017 and see if you get the same error. When installing Unity the Visual Studio it suggests is the 2017 version. I imagine they may not yet support VS 2019 fully. As I said, just a hunch, but worth trying.

EDIT: Just realized the "2019" part was likely Unity version, but if not, try the mentioned :-)