Revit二次开发完全指南：从入门到精通

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"Revit开发指南是一本专为Revit初学者设计的二次开发书籍，它详尽地涵盖了Revit平台API的各个方面，包括各个功能的编程类和函数的使用方法，并通过大量的实例来演示API的应用。这本书由Keldar67@gmail.com撰写，包含了从入门到进阶的全方位指导，旨在帮助读者熟练掌握Revit的定制化开发能力。" 在Revit开发中，Revit2014PlatformAPI是开发者的主要工作平台，提供了丰富的接口和工具供开发者使用。开发者指南首先介绍了Revit平台API的基础信息，包括欢迎语、可以实现的功能、开发需求、安装步骤、支持的编程语言、用户手册以及文档约定。这些内容为初学者构建了良好的学习框架。入门部分，书中通过一系列的"Walkthroughs"（引导教程）逐步引导读者进入Revit开发的世界。例如，"HelloWorld"引导教程教授如何创建并运行一个简单的Revit插件，展示最基本的API调用；"AddHelloWorldRibbonPanel"则深入到UI层面，教读者如何在Revit界面中添加自定义的Ribbon面板；"RetrieveSelectedElements"和"RetrieveFilteredElements"两个教程分别讲解如何获取用户选择的元素以及根据特定条件筛选元素，这些都是Revit二次开发中常见的操作。进一步，书中的"Add-In Integration"章节详细阐述了Revit插件的集成机制，包括概述、外部命令（External Commands）和外部应用（External Applications）。外部命令是Revit插件中最基础的元素，允许开发者添加自定义的命令到Revit界面，执行特定任务；外部应用则更加强大，可以提供持续的后台服务，与Revit模型进行深度交互。此外，该指南还可能涵盖API的其他关键概念，如事件处理、图元操作、参数修改、视图控制、族实例化等。每个主题都会配以代码示例，以便读者更好地理解和实践。通过这本书的学习，读者不仅可以了解Revit API的基本结构，还能掌握如何利用这些工具和方法来实现自己的Revit插件，从而提高工作效率，满足特定的设计和分析需求。

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However, in some cases, an add-in application may fail to load without any message. Possible causes include:

• The add-in application is compiled with a different RevitAPI version

• The manifest file is not found

• There is a formatting error in the .addin manifest file

Q: Why does my add-in application not work?

A: Even though your add-in application is available under External Tools, it may not work. This is most often caused by an exception in the

code.

For example:

Code Region 2-3: Exceptions in Execute()

Command: IExternalCommand

{

A a = new A();//line x

public IExternalCommand.Result Execute ()

{

//…

}

Class A

{

//…

}

The following two exceptions clearly identify the problem:

• An error in line x

• An exception is thrown in the Execute() method.

Revit will display an error dialog with information about the uncaught exception when the command fails.

Figure 7: Unhandled exception in External Command

This is intended as an aid to debugging your command; commands deployed to users should use try..catch..finally in the example entry

method to prevent the exception from being caught by Revit. Here's an example:

The Add Panel project is different from Hello World because it is automatically invoked when Revit runs. Use the IExternalApplication

interface for this project. The IExternalApplication interface contains two abstract methods, OnStartup() and OnShutdown(). For more

information about IExternalApplication, refer to Add-in Integration.

Add the following code for the ribbon panel:

Code Region 2-5: Adding a ribbon panel

using Autodesk.Revit.UI;

using Autodesk.Revit.DB;

using System.Windows.Media.Imaging;

class CsAddpanel : Autodesk.Revit.UI.IExternalApplication

{

public Autodesk.Revit.UI.Result OnStartup(UIControlledApplication application)

{

// add new ribbon panel

RibbonPanel ribbonPanel = application.CreateRibbonPanel("NewRibbonPanel");

//Create a push button in the ribbon panel "NewRibbonPanel"

//the add-in application "HelloWorld" will be triggered when button is pushed

PushButton pushButton = ribbonPanel.AddItem(new PushButtonData("HelloWorld",

"HelloWorld", @"D:\HelloWorld.dll", "HelloWorld.CsHelloWorld")) as PushButton;

// Set the large image shown on button

Uri uriImage = new Uri(@"D:\Sample\HelloWorld\bin\Debug\39-Globe_32x32.png");

BitmapImage largeImage = new BitmapImage(uriImage);

pushButton.LargeImage = largeImage;

return Result.Succeeded;

}

public Result OnShutdown(UIControlledApplication application)

{

return Result.Succeeded;

}

Build the Application

After completing the code, build the application. From the Build menu, click Build Solution. Output from the build appears in the Output

window indicating that the project compiled without errors. AddPanel.dll is located in the project output directory.

Create the .addin manifest file

To invoke the application in Revit, create a manifest file to register it into Revit.

1. Create a new text file using Notepad.

2. Add the following text to the file:

Code Region 2-6: Creating a .addin file for an external application

<?xml version="1.0" encoding="utf-8" standalone="no"?>

<Name>SampleApplication</Name>

<Assembly>D:\Sample\AddPanel\AddPanel\bin\Debug\AddPanel.dll</Assembly>

<FullClassName>AddPanel.CsAddPanel</FullClassName>

<VendorDescription>Autodesk, www.autodesk.com</VendorDescription>

</AddIn>

</RevitAddIns>

3. Save the file as HelloWorldRibbon.addin and put it in the following location:

o For Windows XP - C:\Documents and Settings\All Users\Application Data\Autodesk\Revit\Addins\2012\

o For Vista/Windows 7 - C:\ProgramData\Autodesk\Revit\Addins\2012\

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