Arcgis engine 创建文本标注要素添加到表方法一：方法二：

方法一：

主要是使用了ISymbolCollectionElement接口设置了Feature的各种属性

IGeometry pointGeometry 这个几何对象应该是一个IPoint;

esriTextHorizontalAlignment 与 esriTextVerticalAlignment指示这个point在Annotation元素（一个面Polygon）的哪个位置，借此确定放置位置。

ISymbolCollectionElement或者IFormattedTextSymbol还有更多的属性可以设置（本文不做补充）

但是此方法没法设置文本标注的旋转角（方法二可以）

public void CreateAnnotationFeature(IGeometry pointGeometry,string text,string fontName,double fontSize,esriTextHorizontalAlignment horizontalAlignment,
        esriTextVerticalAlignment verticalAlignment)
         {
            IFeature feature = featureClass.CreateFeature();
 
            ISymbolCollectionElement symbolCollectionElement = new TextElementClass();
            symbolCollectionElement.FontName = fontName;
            symbolCollectionElement.Size = fontSize;
            symbolCollectionElement.Text = text;
            symbolCollectionElement.HorizontalAlignment = horizontalAlignment;
            symbolCollectionElement.VerticalAlignment = verticalAlignment;                                     
            symbolCollectionElement.Geometry = pointGeometry;

            IElement element = symbolCollectionElement as IElement;
            IAnnotationFeature2 annotationFeature2 = feature as IAnnotationFeature2;
            annotationFeature2.Annotation =element;
            annotationFeature2.Status = esriAnnotationStatus.esriAnnoStatusPlaced;
            feature.Store();
        }

方法二：

主要使用IFormattedTextSymbol接口的方案

这种方法可以设置的参数好像多一些  fmtTextSymb.Angle 这个就是旋转角 传入的参数为角度

private void AddAnno(IFeatureClass featClass, IPoint pt, string textString)
    {
        IFeature feature = featClass.CreateFeature();
        var annoClass = featClass.Extension as IAnnoClass;
        IFontDisp font = new StdFontClass() as IFontDisp;
        font.Name = "Arial";
        font.Bold = true;
        // font.Size = 30;
// load in some reasonable default values..
        IFormattedTextSymbol fmtTextSymb = new TextSymbolClass();
        fmtTextSymb.Font = font;
        fmtTextSymb.Size = 30;
        fmtTextSymb.VerticalAlignment = esriTextVerticalAlignment.esriTVABottom;
        fmtTextSymb.HorizontalAlignment = esriTextHorizontalAlignment.esriTHALeft;
        fmtTextSymb.Angle = 0;
        fmtTextSymb.CharacterSpacing = 100;
        fmtTextSymb.CharacterWidth = 100;
        fmtTextSymb.FlipAngle = 90;
        fmtTextSymb.Leading = 0;
        fmtTextSymb.WordSpacing = 100;
        fmtTextSymb.Text = textString;  // my special text value..
        ITextElement textElement = new TextElementClass();
        textElement.Symbol = fmtTextSymb;
        textElement.Text = textString;
        IElement element = textElement as IElement;
        element.Geometry = pt;
        (feature as IAnnotationFeature2).Annotation = element;
        feature.Store();
    }
}

参考：https://www.cnblogs.com/yzhyingcool/p/11518652.html

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