tryCatch method above to the ClearScript API.SqlDataReader currently cannot be used directly from script code. The root cause is this .NET bug.SqlDataReader in script code. Consider exposing an alternate API that encapsulates SqlDataReader within another .NET class."'ClearScriptAccessTest.TestClass.TestMethod()' is inaccessible due to its protection level"However, accessing the property succeeds.
class TestClass
{
public int TestProperty { get; set; }
public void TestMethod()
{
}
}
class Program
{
static void Main(string[] args)
{
using (var engine = new V8ScriptEngine())
{
try
{
TestClass testClass = new TestClass();
engine.AddHostObject("testClass", testClass);
engine.Execute(
@"
testClass.TestProperty = 17;
testClass.TestMethod();
"
);
}
catch (Exception ex)
{
Console.WriteLine("Error: '{0}'", ex.Message);
}
}
}
}
class TestClassto
public class TestClassbut in real life this requires changing many other classes.
[assembly: InternalsVisibleTo("ClearScript")]
[assembly: InternalsVisibleTo("ClearScriptV8-64")]
[assembly: InternalsVisibleTo("ClearScriptV8-32")]
Is there a reason why the property is accessible and the method is not?
ScriptEngine.AccessContext. For example:
engine.AccessContext = typeof(Program);function WebClient() {
DownloadString: function (path, callback){
var wc = new System.Net.WebClient();
var result = wc.DownloadString(path);
if (typeof(callback) != "undefined")
{
callback(result);
}
return result;
};
}var w = new WebClient();
w.DownloadString("http://www.google.de/");function WebClient() { this.DownloadString = function (path, callback) { var wc = new System.Net.WebClient(); var result = wc.DownloadString(path); if (typeof(callback) != 'undefined') { callback(result); } return result; }; }
Imports System.Xml
Imports Microsoft.ClearScript
Public Class WebForm1
Inherits System.Web.UI.Page
Public vbs As Windows.VBScriptEngine = New Windows.VBScriptEngine
Public js As Windows.JScriptEngine = New Windows.JScriptEngine
Public xml As XmlDocument = New XmlDocument
Public search As XmlNodeList, this As XmlNode
Public Sub Initialize()
js.AddRestrictedHostObject("me", HostItemFlags.GlobalMembers, Me)
vbs.AddRestrictedHostObject("me", HostItemFlags.GlobalMembers, Me)
xml.LoadXml("<sales><row><product>watch</product><rate>100</rate></row><row><product>laptop</product><rate>600</rate></row></sales>")
Try
search = xml.SelectNodes("//product")
For Each Me.this In search
js.Execute("Response.Write(this.InnerText);")
Response.Write("<BR>")
vbs.Execute("response.write this.innertext")
Response.Write("<BR>")
Next
Catch ex As Exception
Response.Write(ex)
End Try
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
End Class[undefined]
watch
[undefined]
thermosImports System.Data.SqlClient
Imports Microsoft.ClearScript
Public Class WebForm1
Inherits System.Web.UI.Page
Public vbs As Windows.VBScriptEngine = New Windows.VBScriptEngine
Public conn As SqlConnection = New SqlConnection("connection string")
Public da As SqlDataAdapter = New SqlDataAdapter("select top 10 * from table", conn), dt As DataTable = New DataTable
Public Sub Initialize()
js.AddRestrictedHostObject("me", HostItemFlags.GlobalMembers, Me)
vbs.AddRestrictedHostObject("me", HostItemFlags.GlobalMembers, Me)
Try
conn.Open()
vbs.Execute("da.Fill dt")
vbs.Execute("for i = 0 to dt.Rows.Count - 1:for j = 0 to dt.rows.item(i).table.columns.count - 1:response.write dt.rows.item(i).item(j) & "" - "":next:response.write ""<br>"":next")
' ------------------------------------------------------------
' THIS DOES NOT WORK
vbs.Execute("for each row in dt.rows: for each col in row.table.columns: response.write row(col.columnname).tostring: next: next")
' ------------------------------------------------------------
Catch ex As Exception
Response.Write(ex)
Finally
da.Dispose()
dt.Clear()
dt.Dispose()
conn.Close()
conn.Dispose()
End Try
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
End Classfor each statement only works with native VBScript arrays and specially crafted COM objects. ClearScript exposes .NET objects by encasing them in COM-aware wrappers, but it doesn't emulate VBScript collections. That would be an interesting feature to add!Ok I tried it in JScript and it does not work there too.
Count and Item properties. The same technique should work with JScript and V8. The only thing that doesn't work is VBScript's for each statement, and that's because VBScript doesn't recognize those objects as collections.The MS Script Control was so powerful we could do so many things with it.
SqlDataReader (thanks again for that, BTW!), what are you having trouble with?
