R – .net 2.0 security configuration

.net-2.0netSecurity

Are there some help resources, or can anyone give me a brief Idea how I would configure the .net 2 runtime security policies for the following scenario:

I have a windows forms control hosted in IE. The control tries to read from a serial port and write to the event log. Both of these operations fail due to security restrictions in the browser:

Request for the permission of type 'System.Security.Permissions.SecurityPermission,mscorlib, Version=2.0.0.0, Culture=neutral,PublicKeyToken=b77a5c561934e089 failed.

Request for the permission of type 'System.Diagnostics.EventLogPermission,System, Version=2.0.0.0, Culture=neutral,PublicKeyToken=b77a5c561934e089 failed.

I've set my site to be fully trusted by adding it to the list of fully trusted sites in IE, but I still have the problem. I am pretty sure the answer isin the runtime security policies in the .net 2.0 configuration but I just don't know what to change.

Best Answer

Try the following:

Control Panel -> Administrative Tools -> Microsoft .NET Framework 2.0 Configuration

Expand out and select:

.Net Framework 2.0 Configuration -> MyComputer -> Runtime Security Policy -> Machine -> Code Groups -> All_Code

Under that there are the different zones. I'm not sure which one would apply to IE and your scenario, but try the following on each of them (remember to set them back after testing)

Right click on the "??????_Zone" Select the "Permission Set" Tab Change the "Permission Set" combo to "Full Trust"

The "Membership Permission" tab may also lend some clues to which one is correct.

Info on Code Access Security

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C# – Configuring security for a windows forms control hosted in Internet Explorer

You would need to create an installer or have your users grant a higher trust level for your website. These settings are editable under Microsoft .NET Framework configuration. under Administrative Tools. You can also take a look at Chris Sells Wahoo which uses an installer to grant these permissions

.net – Difference between decimal, float and double in .NET

float and double are floating binary point types. In other words, they represent a number like this:

10001.10010110011

The binary number and the location of the binary point are both encoded within the value.

decimal is a floating decimal point type. In other words, they represent a number like this:

12345.65789

Again, the number and the location of the decimal point are both encoded within the value – that's what makes decimal still a floating point type instead of a fixed point type.

The important thing to note is that humans are used to representing non-integers in a decimal form, and expect exact results in decimal representations; not all decimal numbers are exactly representable in binary floating point – 0.1, for example – so if you use a binary floating point value you'll actually get an approximation to 0.1. You'll still get approximations when using a floating decimal point as well – the result of dividing 1 by 3 can't be exactly represented, for example.

As for what to use when:

For values which are "naturally exact decimals" it's good to use decimal. This is usually suitable for any concepts invented by humans: financial values are the most obvious example, but there are others too. Consider the score given to divers or ice skaters, for example.
For values which are more artefacts of nature which can't really be measured exactly anyway, float/double are more appropriate. For example, scientific data would usually be represented in this form. Here, the original values won't be "decimally accurate" to start with, so it's not important for the expected results to maintain the "decimal accuracy". Floating binary point types are much faster to work with than decimals.

Best Answer

Related Solutions

C# – Configuring security for a windows forms control hosted in Internet Explorer

.net – Difference between decimal, float and double in .NET

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