图像的绘制,剪切,旋转,添加文字.生成图像的缩略图
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//按指定大小绘制图像
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private void button1_Click(object sender, System.EventArgs e)
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}
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using System;
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using System.Drawing;
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using System.Collections;
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using System.ComponentModel;
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using System.Windows.Forms;
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using System.Data;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging ;
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