本文整理汇总了C#中System.Data.OleDb.OleDbConnectionStringBuilder.TryGetValue方法的典型用法代码示例。如果您正苦于以下问题：C# OleDbConnectionStringBuilder.TryGetValue方法的具体用法？C# OleDbConnectionStringBuilder.TryGetValue怎么用？C# OleDbConnectionStringBuilder.TryGetValue使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Data.OleDb.OleDbConnectionStringBuilder的用法示例。
在下文中一共展示了OleDbConnectionStringBuilder.TryGetValue方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
//引入命名空间
using System.Data.OleDb;
class Program
{
static void Main()
{
OleDbConnectionStringBuilder builder =
new OleDbConnectionStringBuilder();
builder.ConnectionString = GetConnectionString();
// Call TryGetValue method for multiple
// key names.
DisplayValue(builder, "Data Source");
DisplayValue(builder, "Extended Properties");
// How about implicitly added key/value pairs?
DisplayValue(builder, "Jet OLEDB:System database");
// Invalid keys?
DisplayValue(builder, "Invalid Key");
// Null values?
DisplayValue(builder, null);
Console.WriteLine("Press any key to continue.");
Console.ReadLine();
}
static private void DisplayValue(OleDbConnectionStringBuilder builder, string key)
{
object value = null;
// Although TryGetValue handles missing keys,
// it does not handle passing in a null (Nothing in Visual Basic)
// key. This example traps for that particular error, but
// throws any other unknown exceptions back out to the
// caller.
try
{
if (builder.TryGetValue(key, out value))
{
Console.WriteLine("{0}='{1}'", key, value);
}
else
{
Console.WriteLine("Unable to retrieve value for '{0}'", key);
}
}
catch (ArgumentNullException)
{
Console.WriteLine("Unable to retrieve value for null key.");
}
}
static private string GetConnectionString()
{
// To avoid storing the connection string in your code,
// you can retrieve it from a configuration file using the
// System.Configuration.ConfigurationSettings.AppSettings property.
return "Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=C:\\ExcelDemo.xls;" +
"Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";
}
}