遍历文本内容

[Anonymous]

BlockTable  bt=(BlockTable)tr.GetObject(db.BlockTableId,OpenMode.ForRead,false);

BlockTableRecord btr=(BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace]),OpenMode.ForRead,false);

foreach(objectId id in btr)

{

    Entity ent=tr.GetObject(id,OpenMode.ForRead,false) as Entity;

    string se=id.ObjectClass.DxfName;

    if(se.Equals("TEXT"))

    {

       .......

    }

}

现在是先遍历实体，然后再在实体中找出文本。我现在想做的是在遍历实体前就筛选出文本类型，然后遍历文本类型的实体，该怎么做？请给出代码。

然后帮我找一个CAD中实现他查找对话框的代码。（就是在CAD中输入Find后出现的对话框），有实现这类功能的代码吗？

谢谢！

[norman.yuan]

Well, if you don want to loop through entire ModelSpace for certain type of entities, you can use Editor.SelectAll(SelectionSetFilter filter), something like:

var vals = TypedValue[]

{

    new TypedValue((int)DxfCode.Start, "TEXT"),

    new TypedValue((int)DxfCode.LayoutName, "MODEL")

};

var res=activeDocument.Editor.SelelctAll(new SelectionSetFilter(vals));

if (res.Status==PromptStatus.OK)

{

    using (var tran=.....)

    {

        foreach (var id in res.Value.GetObjectIds())

        {

            var textEntity=(DbText)tran.GetObject(id, OpenMode.ForRead);

            ......

           //comparing DbText's TextString with the text to be searched for here

        }

        tran.Commit()

    }

}

In reality, looping through entire ModelSpace may not be as bad/as slow in comparison to getting a filtered SelectionSet, as one thinks, depending on drawing. And sometimes, the fraction of second difference is ignorable