如何在visual studio扩展中的选择之前获取文本 [英] How to get the text before a selection in visual studio extension

问题描述

我编写了一个扩展程序，可以在当前光标处插入代码.现在我想根据光标前面的内容成为文本.

I have written an extension that inserts code at the current cursor. Now I want to be the text depending on what is in front of the cursor.

案例 1:

// Some comment {insert text here}

这里我想插入没有//"的文本(因为它已经存在了)

Here I want to insert text without the "//" (because its already there)

情况 2:

some Code {insert comment here}

这里我想插入带有//"的文本.

Here I want to insert the text with the "//".

    /// <summary>
    /// Generates the text for an inline comment
    /// </summary>
    /// <returns>The text for an inline comment</returns>
    public string Comment()
    {
        //Get Selection
        var objSel = (TextSelection)_dte2.ActiveDocument.Selection;
        //Save offset
        var offset = objSel.TopPoint.LineCharOffset;
        //move selection to start of line
        objSel.StartOfLine();

        //Get active document
        var activeDoc = _dte2.ActiveDocument.Object() as TextDocument;
        //Get text between selection and offset
        var text = activeDoc.CreateEditPoint(objSel.TopPoint).GetText(offset);

        //move selection back to where it was
        objSel.MoveToLineAndOffset(objSel.TopLine,offset);

        //return text
        return text.Contains("//") ? $@" {GetText()} : " : $"// {GetText()} : ";

    }

问题

这适用于大多数情况.只有两个问题:

The problem

This works for most cases. There are only 2 problems:

1. 在我看来，移动选择并不是一个好习惯.

1. In my opinion its not good practice to move the selection around.

选择文本时会丢失选择，代码运行后选择为空.

When selecting text it will lose the selection and the selection will be empty after the code ran.

如果我能在我的选择所在行的开头得到一个点，我想我可以得到我想要的.然后我可以把这一点放在

I think I could to what I want if I could get a point thats at the start of the line in which my selection is. Then I could put this point in

var text = activeDoc.CreateEditPoint(objSel.TopPoint).GetText(offset);

而不是 objSel.TopPoint.

instead of objSel.TopPoint.

实现我想做的事情的最佳方法是什么?

What is the best way to achieve what I want to do?

推荐答案

我找到了解决方案:

    /// <summary>
    /// Generates the text for an inline comment
    /// </summary>
    /// <returns>The text for an inline comment</returns>
    public string Comment()
    {
        //Get Selection
        var objSel = (TextSelection)_dte2.ActiveDocument.Selection;

        //Create EditPoint
        var editPoint = objSel.TopPoint.CreateEditPoint();
        editPoint.StartOfLine();

        //Get active document
        var activeDoc = _dte2.ActiveDocument.Object() as TextDocument;

        //Get text between EditPoint and Selection
        var text = activeDoc.CreateEditPoint(editPoint).GetText(objSel.TopPoint);

        //return text
        return text.Contains("//") ? $" {GetText()} : " : $"// {GetText()} : ";
    }

关键是线条

var editPoint = objSel.TopPoint.CreateEditPoint();
editPoint.StartOfLine();

有了这个，我可以创建一个新点，然后我将移动到行的开头并获取它和选择 TopPoint 之间的文本

with this I can create a new point which I will then move to the start of the line and get the text between it and the selections TopPoint

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