vb.net StringBuilder.AppendLine() 不换行
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StringBuilder.AppendLine() does not make a new line
提问by Hyman Pettinger
I am generating an email when an error occurs. I am using StringBuilder.AppendLine()and StringBuilder.AppendLine(String)to build up the body of the email, however the body of my email appears as one very long line with no line breaks.
发生错误时我正在生成电子邮件。我正在使用StringBuilder.AppendLine()和StringBuilder.AppendLine(String)来构建电子邮件的正文，但是我的电子邮件正文显示为一行很长的行，没有换行符。
For example:
例如：
Dim ErrorsStringBuilder As New StringBuilder
ErrorsStringBuilder.AppendLine(String.Format("Status : {0} Message : {1}", Results.Status, Results.ErrorMessage))
ErrorsStringBuilder.AppendLine(String.Format("Failed : {0} Total : {1}", Results.FailedCount, Results.TotalCount))
ErrorsStringBuilder.AppendLine("Batch #: " & Results.BatchNumber)
ErrorsStringBuilder.AppendLine()
ErrorsStringBuilder.AppendLine("Individual Errors:")
ErrorsStringBuilder.AppendLine()
For Each FailedRecord .......
ErrorsStringBuilder.AppendLine(String.Format("Failed Record ID : {0} Message : {1}", FailedRecord.ID, FailedRecord.ErrorText))
Next
This is the description from MSDN for .AppendLine()and .AppendLine(String)respectively.
这是来自 MSDN 的.AppendLine()和.AppendLine(String)分别的描述。
Appends the default line terminator to the end of the current StringBuilder object.
Appends a copy of the specified string followed by the default line terminator to the end of the current StringBuilder object.
将默认行终止符附加到当前 StringBuilder 对象的末尾。
将指定字符串的副本后跟默认行终止符附加到当前 StringBuilder 对象的末尾。
My question is: whyis there no line break? Whyis the default line terminator not being applied? Am I misunderstanding the description?
我的问题是：为什么没有换行符？为什么没有应用默认的行终止符？我误解了描述吗？
ps. I did look at this questionbut there is no explaination to why.
附：我确实看过这个问题，但没有解释为什么。
and I know that I can use System.Environment.NewLineor "\n"to get linebreaks.
并且我知道我可以使用System.Environment.NewLine或"\n"获取换行符。
回答by Parag Meshram
It seems that your email body is of type HTMLbut you are rendering simple text-
似乎您的电子邮件正文属于类型，HTML但您正在渲染simple text-
If you really want it to be simple textthen in your email object set IsBodyHtml = falseit will render new lines without modifying your StringBuilder code -
如果你真的希望它simple text在你的电子邮件对象集中，IsBodyHtml = false它会在不修改你的 StringBuilder 代码的情况下呈现新行 -
MailMessage mail = new MailMessage();
mail.IsBodyHtml = false;
If you want HTML only then try adding after every line -
如果您只想要 HTML，请尝试在每一行之后添加 -
ErrorsStringBuilder.AppendLine("<br />");
Actually you are trying to build HTML output.
实际上，您正在尝试构建 HTML 输出。
In HTML if you write -
在 HTML 中，如果你写 -
<html>
<body>
Hi,
How are you?
</body>
</html>
It would result in -
这会导致——
Hi, How are you?
To make it work, you should enclose these two statements in to two different block elements -
为了使其工作，您应该将这两个语句包含在两个不同的块元素中 -
In this case I am using paragraph -
在这种情况下，我使用的是段落 -
<html>
<body>
<p>Hi,</p>
<p>How are you?</p>
</body>
</html>
now this will result in -
现在这将导致 -
Hi,
How are you?
In your case you need to figure out HTML to render required output. Otherwise use <br />as a workaround.
在您的情况下，您需要找出 HTML 来呈现所需的输出。否则<br />用作解决方法。
Example for HTML with <p>tag -
带有<p>标签的HTML 示例-
Dim ErrorsStringBuilder As New StringBuilder
ErrorsStringBuilder.AppendLine(String.Format("<p>Status : {0} Message : {1}</p>", Results.Status, Results.ErrorMessage))
ErrorsStringBuilder.AppendLine(String.Format("<p>Failed : {0} Total : {1}</p>", Results.FailedCount, Results.TotalCount))
ErrorsStringBuilder.AppendLine("<p>Batch #: </p>" & Results.BatchNumber)
ErrorsStringBuilder.AppendLine()
ErrorsStringBuilder.AppendLine("<p>Individual Errors:</p>")
ErrorsStringBuilder.AppendLine()
For Each FailedRecord .......
ErrorsStringBuilder.AppendLine(String.Format("<p>Failed Record ID : {0} Message : {1}</p>", FailedRecord.ID, FailedRecord.ErrorText))
Next
回答by Kna?is
Since it appears as one long line your e-mail message is most probably set to display as HTML, not plain text. In HTML you have to use <br/>for line breaks.
由于它显示为一长行，您的电子邮件消息很可能设置为显示为 HTML，而不是纯文本。在 HTML 中，您必须使用<br/>换行符。
You could try ErrorsStringBuilder.Replace(Environment.NewLine, Environment.NewLine + "<br/>")at the end of your code to add the HTML line breaks.
您可以尝试ErrorsStringBuilder.Replace(Environment.NewLine, Environment.NewLine + "<br/>")在代码末尾添加 HTML 换行符。
回答by ajakblackgoat
If you want to use HTML format for the email body, wrap your ErrorsStringBuilder output inside <pre>...</pre>tags to preserves both spaces and line-breaks and use fixed width fonts to maintain formatting.
如果您想对电子邮件正文使用 HTML 格式，请将您的 ErrorsStringBuilder 输出包装在<pre>...</pre>标签内以保留空格和换行符，并使用固定宽度的字体来保持格式。
