C#实现下拉菜单选择文件夹

要在C#中实现下拉菜单选择文件夹，可以使用Unity的EditorGUILayout下拉菜单和EditorUtility.OpenFolderPanel方法。下面是一个示例代码：

using UnityEngine;
using UnityEditor;

public class FolderSelectionWindow : EditorWindow
{
    private string selectedFolder;

    \[MenuItem("Window/Folder Selection")\]
    public static void ShowWindow()
    {
        GetWindow<FolderSelectionWindow>("Folder Selection");
    }

    private void OnGUI()
    {
        GUILayout.Label("Select a folder:", EditorStyles.boldLabel);

        if (GUILayout.Button("Select Folder"))
        {
            selectedFolder = EditorUtility.OpenFolderPanel("Select Folder", "", "");
        }

        GUILayout.Label("Selected Folder: " + selectedFolder);
    }
}

这个代码创建了一个名为"Folder Selection"的窗口，其中包含一个按钮和一个标签。当点击按钮时，会弹出文件夹选择对话框，选择的文件夹路径会显示在标签中。

要使用这个代码，将其放在Unity项目的Editor文件夹中，并在Unity编辑器中选择"Window/Folder Selection"菜单项即可打开窗口。
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