GetMethod（）返回null

Question

我有一类查询

public class gridQueries
{
    ....

    public string propertiesCombinedNamesQuery { get; set; } =
        "SELECT [NameId], [CombinedName] AS Display FROM [Names] ORDER BY [CombinedName]";
    ....
}  // end class gridQueries 

在另一个方法中，我获取此查询名称的字符串，然后尝试调用它，但是GetMethod()始终返回null 。

// Get the short name of the dependent field from the dictionary value[2] string
string _1DF_Name = addEditFieldControl.FirstOrDefault(p => p.Value[1].Contains(fieldShortName)).Key;
// Find the long name of the dependent field
string Value1Text = addEditFieldControl.FirstOrDefault(p => p.Key.Contains(_1DF_Name)).Value[1];

这给了我一个看起来像这样的字符串“ _Q_propertiesCombinedNamesQuery_OwnerName”

// Couldn't get invoke to work.
// because MethodInfo info is null after the GetMethod() call

string queryMethod = "";
queryMethod = "queries."+strIsBtwTags(Value1Text, "_Q_", "_");
Type queriesType = queryMethod.GetType();
MethodInfo info = queriesType.GetMethod(queryMethod);

string query = info.Invoke(null, null).ToString();

谁能发现我在做什么错？ 还是建议一种方法来调用此字符串作为方法，以便我可以在其中获得带有SQL查询的返回字符串？

任何帮助都将不胜感激。

Answer 1

我将属性声明转换为方法声明（感谢约翰·多伊在上面的评论中）

从：

public class gridQueries
{
    ....
    public string propertiesCombinedNamesQuery { get; set; } =
        "SELECT [NameId], [CombinedName] AS Display FROM [Names] ORDER BY [CombinedName]";
    ....
}

至：

public class gridQueries
{
    ....
    public string propertiesCombinedNamesQuery() 
    {
        return "SELECT [NameId], [CombinedName] AS Display FROM [Names] ORDER BY [CombinedName]";
    }
    ....
} 

从程序中，我调用方法

// Top of program
using System.Reflection;
....
....
string qstring = "propertiesCombinedNamesQuery";
string query = ""

gridQueries q2 = new gridQueries();
MethodInfo methodInfo = q2.GetType().GetMethod(qstring);
query = (string)methodInfo.Invoke(q2, null);
....

查询现在包含SELECT [NameId], [CombinedName] AS Display FROM [Names] ORDER BY [CombinedName]

这可行。

我所缺少的是将类名作为Invoke语句的第一个参数传递。