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Asked: 2026-05-29T23:00:03+00:00

I have an HTML file that will act as a template for an email

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I have an HTML file that will act as a template for an email that I am going to send out. There are fields in the html that are variable. I was wondering if there is a robust way to replace the placeholders in the HTML file with the variables. I know I could string.Replace all of them, but that isn’t ideal since I have a lot of variables. Here is what the html file looks like

<html>
<head>
<title></title>
</head>
<body>
<div>
    Please read the Cruise Control Details Below<br>
    <br>
    <table width='100%'>
        <tr>
            <td width='100%' colspan='5'>
                <font size='4'><b>Release Details</b></font>
            </td>
        </tr>
        <tr>
            <td width='20%'>
                <b>RFC Ticket #</b>
            </td>
            <td>
                %release.RFCTicket%
            </td>
            <td>
                &nbsp;
            </td>
            <td>
                &nbsp;
            </td>
            <td width='10%'>
                &nbsp;
            </td>
            <td width='20%'>
                <b>Project / Release Name</b>
            </td>
            <td width='20%'>
                %release.ReleaseName%
            </td>
        </tr>
        <tr>
            <td width='20%'>
                <b>Release Date</b>
            </td>
            <td width='20%'>
                %release.ReleaseDateString%
            </td>
            <td>
                &nbsp;
            </td>
            <td>
                &nbsp;
            </td>
            <td width='10%'>
                &nbsp;
            </td>
            <td width='20%'>
                <b>Release Time</b>
            </td>
            <td width='20%'>
                %release.ReleaseTimeString%
            </td>
        </tr>
        <tr>
            <td width='20%'>
                <b>CAB Approval Status</b>
            </td>
            <td width='20%'>
                %release.CABApproval%
            </td>
        </tr>
        <tr>
            <td width='100%' colspan='5'>
                &nbsp;
            </td>
        </tr>
        <tr>
            <td width='100%' colspan='5'>
                <font size='4'><b>Contact Information:</b></font>
            </td>
        </tr>
        <tr>
            <td width='20%'>
                <b>Project / Team Lead</b>
            </td>
            <td width='20%'>
                %release.TeamLead%
            </td>
            <td width='10%'>
                &nbsp;
            </td>
            <td width='20%'>
                <b>On Call DSE</b>
            </td>
            <td width='20%'>
                %release.OnCallDSE%
            </td>
        </tr>
        <tr>
            <td width='20%'>
                <b>Phone</b>
            </td>
            <td width='20%'>
                %release.ContactInfo%
            </td>
            <td>
                &nbsp;
            </td>
            <td>
                &nbsp;
            </td>
            <td>
                &nbsp;
            </td>
            <td width='10%'>
                &nbsp;
            </td>
            <td width='20%'>
                <b>Phone</b>
            </td>
            <td width='20%'>
                %release.OnCallDSEContact%
            </td>
        </tr>
        <tr>
            <td>
                &nbsp;
            </td>
        </tr>
        <tr>
            <td width='100%' colspan='5'>
                <font size='4'><b>Migration Details:</b></font>
            </td>
        </tr>
        <tr>
            <td width='20%'>
                <b>Deploy Dashboard</b>
            </td>
            <td width='20%'>
                &nbsp;
            </td>
            <td width='10%'>
                &nbsp;
            </td>
            <td width='20%'>
                <td>
                    &nbsp;
                </td>
                <td>
                    &nbsp;
                </td>
                <b>Deploy Task</b>
            </td>
            <td width='20%'>
                &nbsp;
            </td>
        </tr>
        %createTaskTable(ParseSpecialInstuctions().Split('|'))%</table>
</div>

I would like to replace the values in between the “%%” with the variable in code that represents them. I could easily

string.Replace("%release.RFCTicket%",release.RFCTicket);

But that’s a bit convoluted in my opinion since I have like 10 or so variables in the file. Are there any built in methods that do what I am asking? Any help would be appreciated, thanks!

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1 Answer

  1. Editorial Team

    Use a regular expression to find your matches. I believe the appropriate regular expression would be along the lines of:

    %release.\S+%

    From there, you can examine each match, and parse the member name from the match. From there you can get the value of the member from your instance (release in this case) via reflection, and do a string replace.

    Something like this. It could use some refactoring to eliminate redundant calls, and I don’t know if it fully works, but you get the idea…

    var regex = new Regex("%release.\S+%");
var match = r.Match(htmlText);
while (match.Success) 
{   
    var value = match.Value;
    var memberName = ParseMemberName(value); //Some code you write to parse out the member name from the match value
    var propertyInfo = release.GetType().GetProperty(memberName);
    var memberValue = propertyInfo.GetValue(release, null);
    htmlText = htmlText.Replace(value, memberValue != null ? memberValue.ToString() : string.Empty);
    match = match.NextMatch();
}
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