本文将详细介绍如何使用C# 、VB.NET给PowerPoint文档添加多行多列文本水印。

using Spire.Presentation;
using Spire.Presentation.Drawing;
using System;
using System.Drawing;
using System.Windows.Forms;

namespace WatermarkDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            //加载示例文档
            Presentation presentation = new Presentation();
            presentation.LoadFromFile("Sample.pptx");

            //获取文本的大小
            Font font = new Font("宋体", 20);
            String watermarkText = "冰蓝科技";
            SizeF size = TextRenderer.MeasureText("E-iceblue", font);
            float x = 30;
            float y = 80;
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    //绘制文本，设置文本格式并将其添加到第一张幻灯片
                    RectangleF rect = new RectangleF(x, y, size.Width, size.Height);
                    IAutoShape shape = presentation.Slides[0].Shapes.AppendShape(Spire.Presentation.ShapeType.Rectangle, rect);
                    shape.Fill.FillType = FillFormatType.None;
                    shape.ShapeStyle.LineColor.Color = Color.White;
                    shape.Rotation = -45;
                    shape.Locking.SelectionProtection = true;
                    shape.Line.FillType = FillFormatType.None;
                    shape.TextFrame.Text = watermarkText;
                    TextRange textRange = shape.TextFrame.TextRange;
                    textRange.Fill.FillType = FillFormatType.Solid;
                    textRange.Fill.SolidColor.Color = Color.FromArgb(120, Color.HotPink);
                    textRange.EastAsianFont = new TextFont(font.Name);
                    textRange.FontHeight = font.Size;

                    x += (100 + size.Width);
                }
                x = 30;
                y += (100 + size.Height);
            }

            //保存文档
            presentation.SaveToFile("Watermark_result.pptx", FileFormat.Pptx2010);

        }
    }
}

Imports Spire.Presentation
Imports Spire.Presentation.Drawing
Imports System
Imports System.Drawing
Imports System.Windows.Forms

Namespace WatermarkDemo
    
    Class Program
        
        Private Shared Sub Main(ByVal args() As String)
            '加载示例文档
            Dim presentation As Presentation = New Presentation
            presentation.LoadFromFile("Sample.pptx")
            '获取文本大小
            Dim font As Font = New Font("宋体", 20)
            Dim watermarkText As String = "冰蓝科技"
            Dim size As SizeF = TextRenderer.MeasureText("E-iceblue", font)
            Dim x As Single = 30
            Dim y As Single = 80
            Dim i As Integer = 0
            Do While (i < 3)
                Dim j As Integer = 0
                Do While (j < 3)
                    '绘制文本，设置文本格式并将其添加到第一张幻灯片 
                    Dim rect As RectangleF = New RectangleF(x, y, size.Width, size.Height)
                    Dim shape As IAutoShape = presentation.Slides(0).Shapes.AppendShape(Spire.Presentation.ShapeType.Rectangle, rect)
                    shape.Fill.FillType = FillFormatType.None
                    shape.ShapeStyle.LineColor.Color = Color.White
                    shape.Rotation = -45
                    shape.Locking.SelectionProtection = true
                    shape.Line.FillType = FillFormatType.None
                    shape.TextFrame.Text = watermarkText
                    Dim textRange As TextRange = shape.TextFrame.TextRange
                    textRange.Fill.FillType = FillFormatType.Solid
                    textRange.Fill.SolidColor.Color = Color.FromArgb(120, Color.HotPink)
                    textRange.EastAsianFont = New TextFont(font.Name)
                    textRange.FontHeight = font.Size
                    x = (x + (100 + size.Width))
                    j = (j + 1)
                Loop
                
                x = 30
                y = (y + (100 + size.Height))
                i = (i + 1)
            Loop
            
            '保存文档
            presentation.SaveToFile("Watermark_result.pptx", FileFormat.Pptx2010)
        End Sub
    End Class
End Namespace

效果图：