c＃覆盖富文本框中的当前行（在写入之前将光标返回到行的左侧）

Question

我有一个Windows应用程序，我试图将当前下载的文件数量写入richtextbox。 我试图让它在同一条线上输出，覆盖过去的细节，但是，我只是设法附加以前的数据。

  

0.01 MB / 7.53 MB＆m; 0.01 MB / 7.53 MB＆m ... 0.08 MB / 7.53 MB＆m ... 0.08 MB＆＃39; s / 7.53 MB＆＃39; s0.14 MB / 7.53 MB＆＃39.14 MB / 7.53 MB＆＃39.18 MB / 7.53 MB＆＃39; s0 .24 MB / 7.53 MB＆t; 2.24 MB / 7.53 MB＆m; 2.27 MB / 7.53 MB＆n.33 MB＆＃39 / s / 7.53 MB的0.33 MB / 7.53 MB的0.34 MB / 7.53 MB的0.39 MB / 7.53 MB＆m.45 MB / 7.53 MB＆lt; 0.45 MB / 7.53 MB＆＃0. s2.5 MB / 7.53 MB＆＃0.52 MB / 7.53 MB＆ ＃39; s0.58 MB / 7.53 MB＆s; 0.58 MB / 7.53 MB＆m 3.65 MB / 7.53 MB＆＃0. s 0.65 MB＆＃ 39; s / 7.53 MB＆lt; 0.71 MB / 7.53 MB＆lt; 0.71 MB＆s; / 7.53 MB＆＃39.31 MB / 7.53 MB＆＃39 ; s0.79 MB / 7.53 MB＆m; 0.85 MB / 7.53 MB＆m; 0.90 MB / 7.53 MB＆s.93.93 MB＆＃39; s / 7.53 MB＆lt; 0.99 MB / 7.53 MB＆s> 1.00 MB / 7.53 MB＆lt; 1.06 MB＆/ s> 7.53 MB＆＃39; s1 .06 MB / 7.53 MB＆lt; 12.12 MB / 7.53 MB＆n.1.13 MB＆＃39 ; s / 7.53 MB＆＃39.1 s MB / 7.53 MB＆s.1.19 MB / 7.53 MB＆lt; 1.25 MB / 7.53 MB＆＃39; s1.26 MB＆s; / 7.53 MB＆nbsp; 1.32 MB / 7.53 MB＆s.32 MB / 7.53 MB＆s.38 MB＆＃39; s / 7.53 MB＆lt; 1.39 MB / 7.53 MB＆gt; 1.44 MB / 7.53 MB＆lt; 1.50 MB / 7.53 MB＆＃39; s1。 50 MB / 7.53 MB＆s; 1.50 MB / 7.53 MB＆s 1.57 MB / 7.53 MB＆s 1.57 MB / 7.53 MB的1.63 MB / 7.53 MB的1.63 MB / 7.53 MB＆s; 1.69 MB / 7.53 MB＆s; 1.70 MB＆ ＃39; s / 7.53 MB＆s; 17.75 MB / 7.53 MB＆s1.81 MB / 7.53 MB＆＃391.81 MB / 7.53 MB＆＃ 39; s1.81 MB＆rs; 7.53 MB＆s; 1.87 MB / 7.53 MB＆s; 1.87 MB / 7.53 MB＆gt; 1.94 MB＆＃39 ; s / 7.53 MB＆gt; 1.94 MB / 7.53 MB＆s 2.00 MB / 7.53 MB＆s 2.00 MB / 7.53 MB＆＃39; s2.06 MB＆s; / 7.53 MB＆＃39; 2.00 MB / 7.53 MB＆＃39; s2.12 MB / 7.53 MB＆s.42 MB＆＃39; s / 7.53 MB＆＃39; s2.18 MB / 7.53 MB＆＃29.1 MB / 7.53 MB＆＃ 39; s2.25 MB / 7.53 MB＆s; 2.25 MB / 7.53 MB＆＃39; s2.31 MB / 7.53 MB＆s.32 MB＆＃39 ; s / 7.53 MB＆s 2.37 MB / 7.53 MB＆s 2.34 MB / 7.53 MB＆s 2.34 MB / 7.53 MB＆＃39; s2.43 MB / 7.53 MB＆s 2.50 MB / 7.53 MB＆s 2.50 MB / 7.53 MB＆s 2.56 MB＆＃39; s / 7.53 MB＆lt; 2.56 MB / 7.53 MB＆＃2.s2.62 MB / 7.53 MB＆＃2.64 MB / 7.53 MB＆＃39; s2。 70 MB / 7.53 MB＆rs 2.71 MB / 7.53 MB＆rs 2.77 MB / 7.53 MB＆m 2.77 MB / 7.53 MB的2.84 MB / 7.53 MB的2.85 MB / 7.53 MB的2.91 MB / 7.53 MB＆＃2.92 MB＆ ＃39; s / 7.53 MB＆lt; 2.98 MB / 7.53 MB＆quot; 2.98 MB / 7.53 MB＆＃2.99 MB / 7.53 MB＆＃ 39; s3.05 MB / 7.53 MB＆m3.06 MB / 7.53 MB＆s.32 MB＆rbsp; 7.53 MB＆n.32 MB＆＃39 ; s / 7.53 MB＆n.3.12 MB / 7.53 MB＆n.3.18 MB / 7.53 MB＆n.3.19 MB / 7.53 MB＆＃39; s3.19 MB / 7.53 MB＆m.3.25 MB / 7.53 MB＆n.35 MB＆＃3 9; s / 7.53 MB＆s.33.30 MB / 7.53 MB＆n.37 MB / 7.53 MB＆n.37 MB / 7.53 MB＆＃39 ; s3.43 MB / 7.53 MB＆n.33.3 MB / 7.53 MB＆s.3.49 MB / 7.53 MB＆n.3.50 MB＆＃39; s / 7.53 MB＆m.3.56 MB / 7.53 MB＆m.3.56 MB / 7.53 MB＆m 3.62 MB / 7.53 MB＆＃39; s3 .62 MB / 7.53 MB＆m 3.63 MB / 7.53 MB＆n.3.69 MB / 7.53 MB＆n.3.69 MB＆＃39; s / 7.53 MB的3.69 MB / 7.53 MB的3.74 MB / 7.53 MB的3.80 MB / 7.53 MB＆＃39; s 3.80 MB / 7.53 MB＆m 3.87 MB / 7.53 MB＆m 3.87 MB / 7.53 MB＆n.3.93 MB / 7.53 MB＆ ＃39; s3.93 MB / 7.53 MB＆s 39.99 MB / 7.53 MB＆s.39.99 MB / 7.53 MB＆m.45 MB＆＃ 39; s / 7.53 MB＆lt; 4.11 MB / 7.53 MB＆lt; 4.11 MB / 7.53 MB＆gt; 4.48 MB / 7.53 MB＆＃39 ; s4.18 MB / 7.53 MB＆lt; 4.24 MB / 7.53 MB＆gt; 4.24 MB / 7.53 MB＆＃39; s4.31 MB＆＃39; s / 7.53 MB＆lt; 4.31 MB / 7.53 MB＆gt; 4.36 MB＆/ 393 / MB＆ ＃39; s4.42 MB / 7.53 MB＆gt; 4.43 MB / 7.53 MB＆gt; 4.49 MB / 7.53 MB＆gt; 4.49 MB＆＃ 39; s / 7.53 MB＆gt; 4.56 MB / 7.53 MB＆gt; 4.56 MB / 7.53 MB＆gt; 4.62 MB / 7.53 MB＆＃39 ; s4.62 MB / 7.53 MB＆gt; 4.67 MB / 7.53 MB＆gt; 4.74 MB / 7.53 MB＆gt; 4.74 MB＆＃39; s / 7.53 MB＆m4.80 MB / 7.53 MB＆m4.80 MB / 7.53 MB＆m 4.87 MB / 7.53 MB＆＃39; s4 .87 MB / 7.53 MB＆lt; 4.93 MB / 7.53 MB＆gt; 4.93 MB / 7.53 MB＆s.49.99 MB＆＃39 / s / 7.53 MB的5.05 MB / 7.53 MB的5.05 MB / 7.53 MB的5.18 MB / 7.53 MB的5.11 MB / 7.53 MB＆lt; 5.18 MB / 7.53 MB＆＃53.18 MB / 7.53 MB＆gt; 5.44 MB / 7.53 MB＆ ＃39; s5.24 MB / 7.53 MB＆s; 3.30 MB / 7.53 MB＆＃39.31 MB / 7.53 MB＆s.37 MB＆＃ 39; s / 7.53 MB＆s.37 MB / 7.53 MB＆gt; 5.42 MB / 7.53 MB＆gt; 5.48 MB / 7.53 MB＆＃39 ; s5.49 MB / 7.53 MB＆s; 5.55 MB / 7.53 MB＆s; 5.55 MB＆＃ 39; s / 7.53 MB＆gt; 5.61 MB / 7.53 MB＆gt; 5.6-1 MB / 7.53 MB＆gt; 5.66 MB / 7.53 MB＆＃39 ; s5.68 MB / 7.53 MB＆rs.3.74 MB / 7.53 MB＆s; 5.8 MB / 7.53 MB＆s 5.86 MB＆＃39; s / 7.53 MB＆lt; 5.92 MB / 7.53 MB＆gt; 5.92 MB / 7.53 MB＆gt; 5.99 MB / 7.53 MB＆＃39; s5 .99 MB / 7.53 MB＆m.4.04 MB / 7.53 MB＆＃39.11 MB / 7.53 MB＆＃39.11 MB＆＃39 / s / MB / s 7.53 MB＆＃39.17 MB / 7.53 MB＆r.47 MB​​ / 7.53 MB＆s.63 MB / 7.53 MB＆＃39; s6.24 MB / 7.53 MB＆s.38 MB / 7.53 MB＆s = 3.30 MB / 7.53 MB＆s.36 MB / 7.53 MB＆ ＃39; s6.42 MB＆rs; 7.53 MB＆s.42 MB / 7.53 MB＆s.48 MB / 7.53 MB＆s.449 MB＆＃ 39; s / 7.53 MB＆＃39.55 MB / 7.53 MB＆＃39.55 MB / 7.53 MB＆＃392 MB / 7.53 MB＆＃39 ; s6.62 MB / 7.53 MB＆s 3.67 MB / 7.53 MB＆s; 6.7 MB / 7.53 MB＆＃39.7 MB MB＆＃39; s / 7.53 MB＆s6.80 MB / 7.53 MB＆s = 6.80 MB / 7.53 MB ＆＃39; s6.86 MB / 7.53 MB＆s = 6.86 MB / 7.53 MB＆＃39.92 MB / 7.53 MB＆＃39.93 MB＆ ＃39; s / 7.53 MB＆gt; 6.98 MB / 7.53 MB＆gt; 7.04 MB / 7.53 MB＆gt; 0.04 MB＆/ s> 7.53 MB＆＃ 39; s7.11 MB / 7.53 MB＆s; 7.11 MB / 7.53 MB＆＃39.17 MB / 7.53 MB＆＃39.17 MB＆＃39 ; s / 7.53 MB＆rs.3.23 MB / 7.53 MB＆rs.3.24 MB / 7.53 MB＆＃39.29 MB / 7.53 MB＆＃39; s7.29 MB / 7.53 MB＆s.3.35 MB / 7.53 MB＆s.36 MB / 7.53 MB＆s.442 MB＆＃39; / 7.53 MB＆＃39; s7.42 MB / 7.53 MB＆＃39; 7.49 MB / 7.53 MB＆＃39.49 MB / 7.53 MB＆＃39; s7。 53 MB / 7.53 MB＆rs.3.53 MB / 7.53 MB

     

下载完成！

我正在尝试（严重）做的是

  

7.53 MB / 7.53 MB

     

下载完成！

其中＆＃34; 7.53 MB / 7.53 MB＆＃34;换行，从＆＃34; 0.01 MB / 7.53 MB＆＃34;＆＃34;一开始一直到＆＃34; 7.53 MB / 7.53 MB＆＃34; （或者，文件有多大）。

我试过的代码是

            int firstCharIndex = richTextBox1.GetFirstCharIndexOfCurrentLine();


        // Calculate download speed and output it .
        if (richTextBox1.SelectionLength == 0)
        {
            int lineNumber = richTextBox1.GetLineFromCharIndex(firstCharIndex);
            richTextBox1.Focus();
            richTextBox1.AppendText(string.Format("{0} MB's / {1} MB's\n",
    (e.BytesReceived / 1024d / 1024d).ToString("0.00"),
    (e.TotalBytesToReceive / 1024d / 1024d).ToString("0.00")));
            firstCharIndex = richTextBox1.SelectionStart;
        }

我希望我已经说清楚了（基本上，我想用下载数据覆盖当前行，直到下载完成）。

有人能帮助我吗？

感谢

Answer 1

删除附加方法：

richTextBox1.Document.Blocks.Clear();
richTextBox1.Document.Blocks.Add(
                             new Paragraph(
                                 new Run(
                                     string.Format("{0} MB's / {1} MB's\n",(e.BytesReceived / 1024d / 1024d).ToString("0.00"),(e.TotalBytesToReceive / 1024d / 1024d).ToString("0.00")
                                 )
                             );

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